Atomic B2 vs Z2 vs Oceanic Delta 4

[paulwlee]

Glad you got it figured out. For those who might look at this later, I have both the B2 as primary and have the Z2 as my backup. Can't tell the difference in performance between the 2 and love both of them.

Yep, the only difference between the B2 and Z2 is the second stage tube. B2 is Ti, Z2 is palladium/zirconium coated brass. All other parts, except for the second stage cover are the same, down to the part number. (obvious difference is if you get the non-swivel first stage for the Z2, but even then it's just the LP port part that's different.) No surprise that the performance is the same.