
Logitech G
G600 MMO Gaming Mouse
MMO button beast, but discontinued and double-click prone.

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I was in this situation recently and decided to try a few different mice. Realize the super light doesn’t give me that “locked in” feeling other mice did. I’d recommend trying a pulsar x2v3 or an endgame op18k wireless. Especially with your hand size. My hands are 18cm
I use a Vaxee NP-01S V2 for monster hunter wilds because I play with Greatsword and I find the clicks really satisfying in terms of feedback with a big and slow weapon. I know I'm not as proficient at FPS with it thought and my "try hard" FPS mouse is an EGG OP1 4K. The OP1 I feel most locked in and responsive with the clocks for FPS games whilst the Vaxee is a very relaxed grip and I often use it for work too.
Ok, under $100 you have a lot of great options. If you aren’t afraid of Chinese clone mice (and you shouldn’t be), you can get literally any shape with an amazing sensor and switch implementation. With that said, My recommendation: Endgame gear. OP1 8k v2 is under 100 and is amazing. It is wired which if that’s a deal breaker, I’d get the OP1w 4k for $80 on amazon right now XM series for larger hands. Hitscan hyperlight is another can’t miss. Pulsar x2 crazy light has gone under $100. I think right now it’s 130. M chose mice are excellent knock offs L7 is basically a pulsar x2 K7 is a viper v3 clone If it were me, I would get an op1 or a viper V3 pro for like $130, or a super light 2c for also I think $130, you’d pay a bit of a premium, but if it’s a gift for your brother, he may not appreciate how cool the lower cost clone brands are and they just want with all the pros are using, and if you buy it off your Amazon and you have how much more no hassle return policy.
Any mouse can be a claw mouse, darn near. If the hump is too high, then you basically are looking for something more flexible, it sounds like. I genuinely think the OP1 8K (or wireless 4k) might be the single best shape on the market. BUT, it’s very narrow. This is good or bad depending on your preference. But the wired version has by far the fastest click latency in existence. You can try the G-wolves VUK, it’s basically a lamzu maya X but 35g. Other shapes I like are the crazylight x2 but that’s a lower hump for sure.
I can second this, I use the OP1w 4k and float between fingertip and relaxed pincer claw. It's a super high quality mouse and the narrow front feels more controlled in CS than pretty much any other mouse I've used besides the G303SE that I mained for a few years.
Using the PMM Pulse W (OP1w 4k mod) right now, really like the low weight with the click latency of the OP1w. My only personal complaints are that the clicks feel a little different and the shell is pretty flimsy (cant really tell while playing though) I stopped using the ATK A9 Ultra and X1 Pro, just didn't like the shape of those (GPX and Viper V3 Clones)
OP1w 4k and artisan raiden arrived yesterday and the combo already feels much better than what ive ever used.

Logitech G
G600 MMO Gaming Mouse
MMO button beast, but discontinued and double-click prone.

VXE
Dragonfly R1 Pro
Lightweight value champ, but small with some QC issues.

Hitscan
Hyperlight
Ultra-light for small hands; 8K dongle sold separately.

Logitech G
G502 HERO High Performance Gaming Mouse
Durable, many buttons, adjustable weight; prone to double-clicks.

Razer
Viper V3 Pro
Lightweight, adaptable shape, high performance; scroll wheel issues.

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Razer - Viper V3 Pro

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Teevolution - Terra

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Razer - Viper Ultimate

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Glorious - Model D Series

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Logitech G - G600 MMO Gaming Mouse

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Razer - Naga Trinity