I was formerly playing Alliance on Flamelash, but when Phase 2 hit it just became a total waste of time so I decided to collect some data on the transfer server populations and faction balance vs. that on Bloodfang.
Full info is in the post below but the TL:DR was that Flamelash seemed to be 36% Ally / 64% Horde, and Bloodfang had almost as many Alliance overall but a 47%/53% faction split.
So far playing on Bloodfang has been a MUCH nicer experience. I did get ganked by 4 Horde camping Lights Hope this morning but in general you can move around the world without too much trouble. Saw a number of 1v1 fights going on in the world, and encountered a number of horde that weren’t aggressive (and saw them encounter Alliance that were highly aggressive). Found raid guild within half an hour of moving too.
So yeah, it’s pretty much what I expected playing a PVP server to be when I rolled PVP 3 months ago. I do think that Bloodfang is a bit quieter than Flamelash is at off-peak times, but it’s still pretty busy.
If you’re finding playing on Flamelash frustrating then I’d definitely consider moving to Bloodfang (especially as BGs are cross-realm). I certainly feel like I’ve made the right choice.