Most guard are universal for your body type (if you have your limbs etc.). You might have to adjust your attack in regards to your opponents (doing a berimbolo against someone really tiny might not be a best choice).
Rafa doesn't like half guard (and it's variants although a old school no shield half sucks much more than a shin shield one) because you don't have proper distance control from it. Lots of high level guys don't like half, especially in the gi (Roger Gracie believes it sucks too). Even some half guard players like Jake Makenzie admit it's not a super strong position mechanically and you have to rely on surprise and tricks a lot.
The top guy is much closer to a pass when in half guard then against a distance oriented game like the Art of Jiu Jitsu guys tend to play.