I've heard if you revedge after harvest, buds aren't as potent ..
Only way to know what pheno to choose , is to do a smoke report .. then keep the one you like (or both if space isn't an issue), and turn the other plant into hash.
That should be interesting with the querkle (purple hash).
you could still top the plant,and take a cutting now, but you wont know if its the keeper you want ..