Have you even used a curado? It doesn't sound like you have. Speculation does not equal knowledge.
The crucial is nice. The spinning rod with full cork is better for spinning.
Sensitivity is very subjective. In depends so much on the user that nobody ccan answer this. Go with what feels the best on your reel at the store.
Fwiw If I had to chose one that's in this range msrp. Fenwick Elite Tech Smallmouth. Theres a few rods they manufacture well.
If u buy used, you open yourself up to a Dobyns champion, legend tournament, cumara A, imx, recon 1 or 2, etc. Used will get you the best rod but screws up this debate.