Varries from shooter to shooter. The simple solution is to find the hold and trigger control combination that imparts no undue influence on the weapon, then, dry-fire and live-fire the heck out of it until it becomes second nature.
I think that those shooters that often use different platforms are at more of a disadvantage than those who commit to practicing with a single frame. In fact, I find that when I go between my XDc Tactical 45 and my XDm 40, my shots start to drift low and left agian with the latter; however, when I work exclusively with my XDm, my shots are more consistantly POA.
No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government ~ Thomas Jefferson
A free people ought not only to be armed, but disciplined. ~George Washington
We are a free people living under a republic of our own construction. We may consent to be governed, but we will not be ruled. ~Kevin D. Williamson