N64/Dreamcast-style 3D platformers/action-games, or GBC-style 2D RPGs?
Which kind of game should I go for? Which is faster to make?

Gonna try my hand at making a 2D DQ-like with a gameplay twist. Gonna prototype the twist first. Should I just use Unity (thus allowing for ez moddability for the final ver as well as faster iteration), or yolo it and do C/C++? I'm comfortable with both Unitydev and enginedev btw, I've nodevved with both options