Do Mono Block amps provide better sound ??

The question is very vague,there's no definitive answer,it's entirely up to you if it's worth it.S

In a word, yes.

Like all things in this hobby, there are diminishing returns and its a personal decision where the spiraling expenses no longer justify more marginal improvements.

Many manufacturers choose to go with monoblocks when they design with no or fewer constraints. Separate power supplies, and other technical advantages make scientific sense. Shorter speaker cables vs. shorter interconnects is a whole debate in itself, but many will agree that a long run of balanced interconnects and short speaker cables makes a ton of sense.

IMHO, if you have high aspirations you will probably end up with monoblocks at some point. Most of the great systems I've heard had them, and I am not surprised. Cheers,

Spencer

It can go either way depending on many variables.

I suspect that part of the answer lies in the consideration of the amount of power available to provide transient dynamic range and also damping to control the speaker excursion to avoid spurious distortion. The separate power supply in each monoblock will have more current available on demand than a power amp sharing a common supply.
Also, assuming non-parallel cable runs near source components and /or good shielding properties in the cables used, crosstalk between adjacent channels is a non-issue when using the monoblocks.