i personally don't like either design, takes away from the whole purpose of "true dual" exhaust.
like with a motor i have in a 2wd i am working on now, it has a true dual setup, and i also notice alittle oil smoke coming from the pass side pipe, this tells me that that head is going to need some service pretty soon,,(like we all don't need that

)
i am just not a big fan of crossover pipes, may as well just run a large diameter single, into a muffler with dual out tips if ya want the dual look, less weight from all the added tubing, extra muffler and money for the setup.
again, this is just my opinion