There are other layouts, like BEAKL, MTGAP, Hands Down (Neu, Gold,Vibranium…). The current recommendation for Colemak on split kb is Colemak Mod DH, but i think the optimal layout depends on the ratio of code to prose that you use.

There is a subreddit dedicated to this very discussion, and the more general subbredit ( r/ergoMechanicalKeyboard) migrated to Lemmy https://lemmy.world/c/ergomechkeyboards

https://www.reddit.com/r/KeyboardLayouts/comments/14m5hpy/no...