Most matches against low-health characters I stay in crane more to get in or get out and then I’ll switch to Mantis after an approach to get my damage done.
Against high-health characters with big punishers I’m usually playing Mantis most of the time and just trying to out-zone them. When I see an opportunity for crane normals or air attacks I’ll try to take it to keep the pressure, mindgames, and mixup fresh, but usually I’m right back in Mantis as soon as we’re reset to square 1.
These are just generalities though. My fingers are faster than a maniac bastard’s so it’s not difficult for me to walk up in crane and then instantly switch and PPP cr.hk to sweep or vice versa to AA. I try to always use whichever stance and moves I think will hit them XD
You get super/ultra comboability, great air attacks, and great crossup and mixup potential from either stance, with Mantis getting a nod in safety and practicality and Crane getting a nod for its WTFability (a new noun has entered the ring!). My advice for newer players is to use whichever stance you prefer and have more success with but try and look for reasons to switch stances as you’re familiarizing yourself with Gen. Chances are you’ll eventually find and learn to abuse them.
Good luck and happy Gennanigans!