Mono blocks are only advantageous if you are switching to them from an amp that had high levels of crosstalk. A competently designed, high-power stereo amp can be just as good or superior.
Do high dollar mono blocks truly improve the Sound Quality over the mid tier amps
I'm currently running a pair of Classe Delta Mono"s to drive my Wilson Alexx V's. IMO they sound wonderful with plenty of power. I've been considering upgrading these amps to the next price/quality level. My biggest concern is whether I'll get the level of improvement in SQ that will move the needle. I'd love to hear from folks who have made this move in their systems or heard comparisons at shows or dealers.