Think S3 and TT arms will be the same in weight.
Both are forged alloy.
The only difference is the adjustability of the TT arms.
The S3/TT wheel bearing has fully machined surfaces,
the Golf/A3 bearing has not. So the S3/TT looks more
beautiful. It's possibly a newer generation. I don't know
if there's any advantage.
But the dimensions are still the same, so all the bearings
fit all three hubs.
ps
Does anybody know the amount of offset of the WALK?