Our Minecraft servers are offline but we will keep this forum online for any community communication. Site permissions for posting could change at a later date but will remain online.
I use caps and find it very comfortable because shift is just hard for me because Im so used to that being my shift key.Either shift/caps would most likely be the best option.
It allows you to use all your movement keys at once unlike some other hotkeys.
Anything works really, but I'd just try to stay away from keys that make you use your Middle/Ring/Pointer finger since those are the main fingers you use to move/strafe (That is if your keys are default movement hotkeys) and try to use something that you can use with your pinky.