IMO ergoclear is the best implementation of an inherently cruddy switch design, but then I prefer the 'collapse' feeling that comes with rubber dome/topre/BS. I started off with a clear board, and absolutely hated the big ramp up in resistance as the switches approached bottom. And the ****ty feeling of the rough slider surfaces sandpapering against each other which just seemed to scream "poor production tolerances."
Ergoclear (65g, lubed) is the only MX switch I can use consistently without wanting to defenestrate, but if I had any of the other keyboard options you mention, I'd not spend the money on MX. Even now I'm typing this on fake Topre (RC930), and this board feels so much smoother- key travel feels both tighther (less rattly) and smoother, with a similar amount of tactility.
Of course, switch preference is highly personal, but if you're used to and like Topre, the Onmikey (I had one too) and BS, then MX is going to be really, really different and probably not in a great way.
I'm partway through changing out a Black board to Zelio switches, and can tell that I prefer them to the original MX already, but I still think that the linearly compressed spring design is the limiting factor in the design.