I’ve had an 8P S3, Golf Mk5 R32 and – more recently – a 2012 (R56) Mini Cooper.
Ok, it’s not a JCW; but I feel able to address some of the issues raised above. I’ve not had the Cooper long, but I do think its interior is a standout feature and of equal quality to the Audi or Golf (which share lots of oily bits with a TT). Of course, it’s a small car – but the rear passenger space is no worse in daily life than the TT, although the boot is small.
There is actually a small digital speedo readout in the dial in front of the steering wheel, so in practice I don’t use the central speedo. First interior impressions are akin to an Edwardian gentleman’s vision of a time machine! The drive is very likable… every inch the “go kart” of Mini advertising lore.
I’d find it hard to choose, but it would depend whether I wanted a motorway cruiser or a more fun, compact all-rounder. People like people in Minis in my humble experience, whereas they view people in Audis (I’ve had a few) with more suspicion!