I’m a Rockshox fanboi after several sets. They seem to work well regardless, but I do try and service every few months now.
Fox always seem to be incredibly expensive and require lots of maintenance – current set of Float 34s are lovely when they work, but noticeably require a service; apparently it’s meant to be done every 30 hours(!).
Not used ‘Zochs since a set of the faulty 55s a few years back – but the new ones are meant to be a lot better and low maintenance to boot. If the weight was right I’d certainly consider a newer pair.
Of the lot, and for a 9mm QR, I’d personally be looking for a set of Revs, Rebas or SIDs.
Edit: I can probably do you a deal on a set of 130mm air Revs or 125mm Fox Vans if you want…