You're right, there are so many times when I have hit R on someone and then they wouldn't normally die until the second hit happens.

With ts, stw can instant kill c moon. Stw can also counter the AoE and double hit.

I'd disagree. STW's attacks don't work well if you're airborne, and C-moon is all about being airborne.

STW is quite fast since the teleport has low cool down so there’s that?

I've never used a ts stand so I wouldn't know myself, but keeping the high ground and jumping frequently can help very well to deal with almost any time stop stand.

What if you suddenly touched the floor?

?

Cmoon all the way

If you touch the ground? Well rip

That's a surprisingly low chance. I've survived many attacks just by jumping.