
Logitech G
G600 MMO Gaming Mouse
Customizable MMO workhorse, durable, but discontinued and pricey.

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OP1 8K v2 is about $90 I think. That’s on the smaller side, and it’s well regarded as one of the best (if not categorically the best) mice for FPS. Even best mouse overall, it outperforms just about everything. Do you prefer symmetrical or ergonomic? The Razer Deathadder v3 is often on sale for $50-70, in my opinion it’s no slouch, it’s ergonomic. Much less of a performer as the OP1 but it is pretty decent. It’s large tho. If you’re interested in Pulsar their mini’s on the smaller size and I’ve seen some models (like x2 v2) on Amazon marked down to $70-90. Those will be wireless and are good. Pulsar also has an XLite (ergo) or X2 (wired) for $50, those are awesome choices IMO.
I have similar size hands to yours. 20 x 10.5. I fingertip a EGG OP1. That said, I also have a Pulsar X2 V2 and had no issues with it. I place my thumb under the forward, backward thumb buttons.
for $70 my x2v2 was well worth it imo
X2V2 wired from Pulsar isn’t bad. I’m currently using it right now after going thru 15 mice.
If you want your palm touching the mouse I would recommend the atk duckbill or as I was recommended today pulsar X2h and X2n. I have similar grip with a little more aggressive claw but I really like having a firm grip on my palm so I can micromanage with my fingers so I love me a good back hump.
With his hand size? I strenously disagree cause for him he would 100% require fingertipping due to the tiny size compared to the GPX and his grip style is basically textbook claw. Considering his hand size the XM2 would be better but it has much more curved sides which is very love it or hate it. If the goal is to maintain rear palm contact he'd be better off with something like Pulsar's X2H/N series of mice in medium, or mini if he prefers a thinner shape.

Logitech G
G600 MMO Gaming Mouse
Customizable MMO workhorse, durable, but discontinued and pricey.

VXE
R1 Series
Budget king: lightweight, great value, long battery life.

Hitscan
Hyperlight
Ultra-light (39g) for small hands; sensor is outdated.

Razer
Viper V3 Pro
Adaptable shape, optical clicks, but scroll wheel malfunctions.

Logitech G
G502 HERO High Performance Gaming Mouse
Durable, heavy workhorse with free-spin scroll; prone to double-clicking.

Ranked #1
Hitscan - Hyperlight

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Teevolution - Terra

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Razer - Viper Ultimate

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ROCCAT (Turtle Beach) - Kone Pro

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Logitech G - G600 MMO Gaming Mouse

Ranked #1
Razer - Naga Trinity