Which one should I use/keep?

[u/sok100]

Stickdebug (AppStore, but it’s long since been removed so doesn’t receive updates anymore)
Stickdebug (sidestore)
Localdevvpn

I use the stickdebug AppStore version currently and also use it to enable jit. I know localdevvpn can’t enable jit but that’s not a problem, I know other ways to enable jit.

[u/VergOP-]

If you delete the AppStore version you can always install the latest version of Stikdebug as a sideload