Well, if you go with the SF750, make sure its the 2024 ATX 3.1 version. Else you wont have much fun with the Super 
Aside of that: Plan EVERY STEP thoroughly. Esp. if this is your first SFF build.
The A4-H2O is a solid case, but its also somewhat inflexible. So cable routing can be a challenge.
Eg. I'm currently in the last few steps of build, and compared to similar small cases, there is next to zero options of hiding away the ATX + EPS cable. There is just no space left between the mainboard and the PSU cage.
To me, thats not a big thing, but only because I planned everything very thoroughly - and also I've done my share of SFF builds.
TL;DR: Planning and measurements are the key elements.
Some cases are more forgiving, etc. the Meshlicious / Meshroom S, but also the S300 and S400, but others arent or are less friendly
cu, w0lf.
