The Cimarron will work better then what you had.
The Toto Drake does work better, better trapway design, and parts can be found at Lowes for it.
I imagine that your plumber has seen the Cimarron, but not the Toto Drake.
So for him, it would be the best "he's" seen.
Certainly not the best, "we've" seen.
But either one will be better then before.