The Roland TD30 Module is identical on both Kits.
Both kits will play same with SD2.
Personally the SD2 is still more realistic but there are some things with supernatural that are good too. (not to mention roland’s famous percussion,Electro,)
The pads will trigger the same.The newer Hi Hat may be a smidge better but how much??
There is a 4th tom on the more expensive TD30KV but that is a real luxury,normal pro players are not playing kits with 2 floor toms ,if you felt you did want it later you could always add a 4th tom . I would add another cymbal for dedicated China/splash to impress and
go for the TD30k,save then invest that money into SD2 and some libraries and give people the very best.
You can always have the Roland’s audio patched in too and see which suits per scenario and drummer.
even with supernatural you have to remember part of the “roland” thing is virtual and SD2 is All Sampled and not a hybrid of Samples with Virtual/synthesis for creating variables, sure it is excellent but a real room and whole kit has many advantages to sound true.

You would get the same results from a TD20/12 really so thats worth a big think especially if like me , you end up only using the real, real sounds on SD2.
I can’t imagine using the Roland in a mix except for A kick sound,Electronics,maybe some percussion and effects or for live and demos/practice.
Some of the newer Snares and Cymbals/Hats are much better but i still believe all the processing they use to get the Parameters available in the module actually detract from reality and are still simulated .