Sig Sauer P365 9mm vs Walther PDP F-Series 4" 9mm

These are not the same size of gun. The Sig Sauer P365 9mm is 5.8" long, 4.3" tall, 1.06" wide and 17.8 oz; the Walther PDP F-Series 4" 9mm is 7.25" long, 5.4" tall, 1.34" wide and 24.0 oz — 6.2 oz more. The PDP carries five more rounds (15 vs 10), runs a 4.0" barrel against 3.1", and has a 1.5" longer sight radius (6.4" vs 4.9"). It is also optic-ready; the P365 is not. Triggers are within 0.1 lb of each other, 5.5 lb against 5.6 lb. MSRP is $519.99 against $699.00.

Pick the Sig Sauer P365 if:

• Concealment governs: 1.06" wide, 4.3" tall and 17.8 oz against 1.34", 5.4" and 24.0 oz
• You want XRAY3 day/night sights front and rear from the box, where the PDP ships standard 3-dot
• You want the smaller gun at the lower price, $519.99 against $699.00

Pick the Walther PDP F-Series 4" if:

• You want half again the rounds on board: 15+1 against 10+1
• Shootability outranks size: a 4.0" barrel, a 6.4" sight radius and a full 5.4" of grip height
• You want a factory optic cut, and a reduced-circumference grip if the issue is small hands rather than small gun

The F-Series addresses hand size, not gun size. If the constraint is what you can conceal, the P365 is 6.2 oz lighter and 0.28" narrower; if it is what fits your hand while you still want 15 rounds and a dot, the PDP is the answer.