Welcome!
I used to have a legacy b4 rsk a good few years ago. I have also had a 2002 uk wrx, 1993 import wrx and currently I have a 2006 STI type uk.
the legacy I had was a very quick and capable car, but a lot more 'grown up' in comparison to the Impreza's. More refined, more gadgets, nicer interior and more conservative looks.
If i were in your position, I would test drive a few of each and make a decision.
Impreza's for me 😎