Do Mono Block amps provide better sound ??

Too many variables to make categorical statements. Separate power supplies CAN make big difference, IF they are of sufficient build quality. Crosstalk is nonexistant, but that benefit can be negated by other sonic factors. It all depends on to what stereo amps the monoblocks are being compared, quality wise and how the monoblocks are configured, within a system. Personally; I like 'em.

One of the the biggest advantages of mono amps is that you can run longer interconnects and the shortest possible speaker cables, where the signal loss is significantly higher. It is simple physics.

In a word, yes

it is like Spencer wrote. Depends on quality of course, but when you try same as mono you will hear the difference. Even with high sensitive Horn Speakers it is a better result (from my experience).

I have always found that a better quality stereo amp is better than 2 average mono amps. When you have superb amp, then mono amps provide just a bit more...this should be the last thing to do...after getting a top of the line Aye, AudioResearch, etc.

I've demoed several same brand stereo /mono amps and have heard no sonic advantage either way . The stereo amps were considerably cheaper so the choice was easy .