I agree with the WTKS votes. It is the best regularly available WT bottling.
I am not sure between RR101 and RB, as I like both quite a bit, but I would definitely pick RB over RR90.
To me, RR101 tastes like a more 'tame' version of RB. If you want a more mellow, slow ride then go with RR101. If you want a bit quicker pace and spark to the tastebuds, go with RB. IMHO, RR101 and KS are closer to the old reliable WT8 than anything else currently on the market from WT. Just the same, both are fantastic pours with KS a slight cut above them.