If you want to practice your gnadgery tech skills i’d go to FOD or Triscombe. If you want to practice something with a bit more length, steepness, pace & rockyness go BPW.
Personally, the value of the Flyup at FOD is borderline. I only manage to get a few more in over just pushing. No one else like jumping into the drop sections at Ski run? I will agree with others, Sheepskull is a nice one to session on. GBU is ok, just that the mid section is a bit meh, better to dive off onto corkscrew.
As for BPW the level of grip negates the perceived technical difficulties. For me, the main issue are the jumps, mainly not having the bottle&/or skill to do the big gaps on the 2 blacks. I doubt i’ll ever do them. Insufficient funds seems to be a good one to get your jumping skills up but you have to be careful as casing badly could pogo you off into a berm. From what I hear from others, the main issue you might have at BPW is arm pump.
[disclaimer] I’ve only ever been to FOD in the pissing wet and still enjoyed it.