I voted Walther as I might sell mine!
Seriously speaking I couldn't split Walther or Steyr and you'd have to try both to see which works best for you. They shoot as well as each other and whilst my Evo10 e and LP400 are quite different to shoot they produce the same scores for me time and time again.
Walther was a concern for me years ago, but there's a service team in the East Midlands that service they and stock the parts and accessories. I'm not sure if they were there 7 years ago or not. Steyr (UK) is basically a family business but parts are widely available and service videos online to do the work yourself if you're so inclined.
I'll be honest I've only shot a Pardini a few times, FWB a fair bit more butt but I couldn't vote for them. Shot a hammerli once and politely handed it back to the owner. Maybe I've been spoilt.
Steyr Challenge HFT - HW97K - BSA Mercury Challenger - Anschutz 9015 One - AA Pro Target - AA Pro Elite - ASI Paratrooper (R) - Walther LP500