I'm a fan of the 365's flat trigger and modularity/flexibility. The same FCU takes you from a pocket gun all the way to an X-Macro. If desired, a manual safety is available on the 365 and is field-installable if you change your mind later. Caliber swap to .380 is also an option on the 365.
The slimline Glocks are a scaled down version of the same gun they've been making for decades, with all the compromises that entails while also lacking parts compatibility with the double-stacks. The 365 is a clean sheet design, and Sig has been continually building up the ecosystem (so far). Although someone heavily invested in Glock might prefer more familiar controls.
If the 365 is too small for you, there are mag floorplates with a lip to extend the grip a bit (albeit with no additional capacity). It adds just enough for me to get an entire hand around the grip. And there's the option of an XL grip or longer mags with a gap filler floorplate.