turbo manifold

What is the advantage, if any of a top mount turbo manifold like the one below? And these are equal runner length. Find out tomorrow if I can get one like this ... without the wastegate flange.

I have a brand new, never installed OBX turbo manifold for the 97-01 Tiburon. Comes with a gasket and shipped in original box. I was going to use it on my Beta II turbo project, since everyone said it would fit, which it doesn't. Bolt holes and outside ports don't match up. So instead of...