I like the sound of the o/r H-pipe better. It's all preference though. The H-pipe usually gives it a little deeper tone and sounds less raspy. I run longtubes with an h pipe and GT500s and I love the sound.
2012 Mustang GT, base, 6MT, 3.73s, Steeda shifter, stage 3 comp cams, CJ intake, CJ TB, REV Auto CAI, JBA LTs, Steeda Sport springs, tuned by AED