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Short answer: the saw and the setup both matter
The Bosch GKS18V-25G and Milwaukee 2730-20 are 6½-inch cordless circular saws built for 18-volt-class battery platforms. Neither one guarantees a straighter cut on its own. Blade condition, shoe alignment, support under the workpiece, and how steadily you guide the saw often matter more than the logo.
For repeated straight cuts, either saw can do the job when paired with a guide. Without one, the best choice is usually the saw that fits your hands and battery system, not a claim that one model tracks perfectly. Check the exact kit and regional specification before buying: bundles and included accessories vary.
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At a glance
| Factor | Bosch GKS18V-25G | Milwaukee 2730-20 |
|---|---|---|
| Platform | Bosch 18V | Milwaukee M18 |
| Blade class | 6½-inch | 6½-inch |
| Best reason to choose it | You already own compatible Bosch batteries and prefer its handling | You already own M18 batteries and want another tool for that system |
| What improves tracking most | A sharp blade, square shoe, and a clamped guide | A sharp blade, square shoe, and a clamped guide |
| Common straight-cut limitation | Freehand cuts can wander if the saw is rushed or the work shifts | Freehand cuts can wander if the saw is rushed or the work shifts |
What “tracks straighter” really means
A cut can look straight from above but still be out of square through the board. For cabinetry or a clean plywood edge, check both the cut line and the blade’s 90-degree relationship to the shoe. A small bevel error becomes obvious across a thick board, while a wandering cut may come from the operator, a flexing guide, or a dull blade.
Before comparing saws, unplug or remove the battery and check that the blade is seated correctly, the shoe is flat, and the blade is square to the shoe. Use a reliable square, and verify the saw’s bevel scale rather than assuming its marks are exact. A damaged blade or loose arbor can produce rough, deflected cuts that no fence will fix.
Bosch GKS18V-25G: a sensible pick for Bosch owners
The Bosch makes the most sense if your batteries and charger are already in the Bosch 18V system. That avoids buying into another platform for one saw. Its 6½-inch blade class is useful for sheet goods and common framing cuts, but check the published depth-of-cut figures for the specific version you are considering, especially if you need to cut thick stock in one pass.
As with any compact circular saw, a light battery may make the tool easier to handle, while a larger pack can add runtime and weight. That extra weight may help the shoe stay planted for some users, but it can also tire your arm during repeated overhead or awkward cuts. Try the grip and trigger reach if possible; comfort affects how consistently you can keep the saw against a guide.
Milwaukee 2730-20: a practical choice for M18 users
The Milwaukee is the straightforward choice when you already own M18 batteries and want to keep chargers and packs interchangeable. It is also a useful option for site work where the saw is one of several M18 tools. The bare-tool price can look attractive, but compare the total cost if you need a battery and charger as well.
Do not treat platform familiarity as proof of better cut accuracy. Confirm the shoe sits flat and the blade is square before a precision job. For both saws, a rough cut can result from forcing the feed, pinching the blade as the offcut drops, or using a general-purpose blade that is dull or poorly suited to the material. Support both sides of the cut so the kerf stays open and the board cannot sag into the blade.
How to get a straighter cut from either saw
For repeatable cuts in plywood, clamp a straightedge or use a purpose-built saw guide. Measure the distance from the blade to the shoe edge, then offset the guide by that amount; do not assume the blade follows the shoe’s outer edge. Make a short test cut in scrap and check the result before cutting the finished panel. A circular saw guide rail is worth considering if you make long sheet cuts regularly.
Keep the base fully supported, let the blade reach speed before entering the wood, and move at a steady pace. If the motor slows, ease off rather than pushing harder. For thin sheet goods, place the good face where the blade’s tooth exit is least likely to damage it, and use a fine-tooth plywood blade when edge quality matters. A fine-tooth 6½-inch plywood blade can reduce tear-out, but it will not correct a crooked setup.
For a basic check, cut a 24-inch line in scrap and measure how far the cut departs from the mark at several points. If the error grows steadily, your guide or hand path is angled. If the cut is straight but beveled, check blade squareness. If the saw binds, stop and inspect support, blade condition, and whether the kerf is closing.
Which one should you buy?
Choose the Bosch if you already have Bosch 18V batteries, or the Milwaukee if you are invested in M18. If you own neither platform, compare the price of a complete kit, battery capacity, warranty, and local service—not just the bare saw. For occasional cuts in studs or rough construction work, the cheaper saw that comes with a usable battery is often perfectly adequate.
If your priority is consistently straight cuts, budget for a guide and a suitable blade before paying extra for a different saw. A guide is the better upgrade for long plywood cuts; a square and careful setup are the better first step when crosscuts are out of square. For repeated framing cuts, a 6½-inch cordless circular saw in your existing battery system is usually the practical buy. Neither model is a substitute for a track saw when furniture-grade panel edges are the main requirement.