Oceanic Delta IV FDX-10 vs. Delta 3 TDX5 Titanium vs. GT 3/CDX-5

I am currently diving the Delta 3 TDX5 Titanium reg setup and being a bit of a gear hound, I'm thinking about buying a new setup. I have been looking at the Delta IV FDX-10 as well as other setups like the Atomic B2.

How does the Delta 3 TDX5 Titanium compare to the Delta IV FDX-10 in terms of performance, comfort and ease of breathing?

Does the Delta IV compare to the Atomic B2 as well?

Also, how does the GT 3/CDX-5 compare to these other setups in terms of performance and ease of breathing?

Thanks.

The Gt3/CDX5 will be virtually identical in performance to what you have, just heavier...

The Delta 4 is higher performance, easier breathing and with the swivel is more comfortable in your mouth than what you have.

The B2 is a fantastic reg, feature to feature and dollar to dollar and performance i honestly think the Delta 4 is a better bang for buck. You won't lose with the B2 or the Delta 4.

What you have is already a very good reg, most divers would not notice the increase in performance if they did do the switch you are considering. I would but then again this is how I make my living...