"H" or "X" Pipe advice Please

I've been told that "X" flows better than "H" mainly due to the smoother transitions and such that the exhaust has to move through.

I was also told (when I got my X-pipe installed on my off-topic truck) that an "H" pipe has to be put at the same distance back from the header collector on both sides. "X" pretty much does that all by itself.

My exhaust guy sprayed some paint on my headpipes from the collector to the muffs. We then ran the engine for a few minutes, and he installed the "X" pipe at the point where the paint burned of the pipes the most. He said thats the optimal location of the crossover pipe, and every installation is different.