Royal Enfield seats – The classics seat can be swapped with the standards seat with a little bit of alteration in the frame. I’ve personally found the standard’s seat very comfortable.
I would have recommended the seat of the old TBTS as it is the most comfortable seat across the lot but the visual appeal of classic is completely ruined if you retrofit the TBTS seat onto it.
You can also look at the relatively cheaper option, adding more cushioning to the company fitted seat of classic. Just ensure that you add stiff foam of considerable hardness and not local sponge. Sponge is comfortable for short rides but once your rear is on it post 100 kms life becomes hell.