I'd have to say that i like the Diamonds just a little bit more than the GC IV's.
The reasons being that, i play a lot of 1 pocket.
To tighten up the pockets in a GC IV, you need to shim the pockets up with whatever shim material the guy setting up the table uses. This can cause problems if you have balls that need to be banked, that are close to the point, cause the shim material, usually gets pushed in after time, and you are left with a non smooth surface.
Sometimes these "divots" can wreck havoc on a tight one pocket game cause if it hits the wrong part of the rail/divot, it might bank WAY OFF as a result.
The other thing is that even though the metal around the pockets is designed to be flush, i have yet to see it. There is always some metal sticking out that can cut a nice grove in your cue if your not careful
With the Diamonds, the pockets are flush with that leather, so there is no scratching, and the rails are i believe, cut to order, depending on the type of pocket you desire.
So the whole rail is consistent.
Other than that, they are both great tables, but GABRIEL's blow them both away.
SUPERSTAR