Which is better for cutting 2x framing lumber?

Both cut 2x at 90 and 45 degrees. The DCS590B does it with more power and a deeper 2-9/16 in. capacity, so it holds speed better in long rips. The DCS391B is fine for occasional framing and cheaper.

Is the DCS590B worth the extra money?

At $167.00 versus $99.00, you pay about $68 for 1,700 MWO, an electric brake, a 7-1/4 in. blade and deeper cuts. If you cut daily or work thick stock, yes. For light home use, the DCS391B covers most jobs.

Do both saws use the same batteries?

Yes. Both run on DeWalt 20V MAX batteries, and neither ships with a battery or charger. The DCS590B is tuned for 20V MAX XR packs.

Which one is easier to control?

The DCS391B is lighter at 8.4 lb versus 9.85 lb. The DCS590B adds an electric brake, which stops the blade fast and helps control after a cut.

Can the DCS391B cut a 4x4?

Not in one pass. Its 2-1/8 in. depth at 90 degrees means you cut from both sides. The DCS590B at 2-9/16 in. still needs two passes on a true 3-1/2 in. 4x4.

Which has better reviews?

Both are rated 4.5 out of 5. The DCS391B has about 2,100 ratings, so its score rests on much more user feedback than the DCS590B's 29.

DeWalt 20V MAX Circular Saw dcs391b vs DEWALT 20V MAX XR Brushless Cordless 7-1/4 in. Circular Saw, Tool Only (DCS590B)

Buy the DCS391B if you want a light, cheap 6-1/2 in. saw for framing, decking and hobby work. Buy the DCS590B if you cut thick stock or 2x all day and want the extra power, depth and electric brake. The DCS391B is $99.00 at Amazon as of November 4, 2026, versus $167.00 for the DCS590B at eBay. The DCS590B has swung between $105.00 and $190.00 in the past week, so its price is far less settled.

Today the DeWalt 20V MAX Circular Saw dcs391b costs $68.00 less at its best price.

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