Why is the FW3A better? Slightly smaller, lighter, nicer clip, metal tail switch, higher regulated modes, cheaper (probably), much fancier firmware.
Why is the D4 better? Sturdier, more emitter/optic/host choices, rubber side switch, higher turbo modes, available today, also comes in throwy D1/D1S flavors.
The original design is more of a fresh off the lathe custom look, this new one is more of an artsy matte bead blasted look.
To be honest, I’m not sure if I’ll go for this light when it is released with the current design.
I really like them both too. I’m not sure which I like better to be honest. I think the original may be prettier and the new may be more practical. I can think of positives to both, but not negatives. I’d really get both, but I’m 100% in for either. Merry Christmas all!