The Best Exhaust Manifolds

So I've had several 6.5's over the years, and have massed a collection of parts. I'm pretty much finished with an Optima build. I'm ready for the bold ons, and have 3 sets of exhaust manifolds, all different part numbers. Are there any particular part numbers better than the rest?

Thanks Yall!

Not really any significant difference with a turbo. Use the one that 1) Fits, and 2) has the least restrictions. There's probably no noticeable difference between them. Also check that the port surfaces on the heads and manifolds are true.