+ 1 from me. Harry nailed it. Ultimately, from a placement POV, there's little difference really. It's more of an aesthetic thing. Both of my racks are curved, I happen to think they look a little better.More or less, it's an "individual" thing. You need to figure out where you're gonna place stuff, and by your own design ..... does a curved rack work better than a straight one?I've owned both, and they work equally well, for me. My personal opinion, it's a tie.
I use both and I too feel their pretty much the same. The curved may look cooler, but then the straight looks cool too.
One thing I tell would be rack users is that racks don't perform as well as stands on uneven stages. If there's even a moderate inconsistency in the stages flatness, or stability, racks can easily twist and cause the toms to loose positioning while you're playing.