Do Mono Block amps provide better sound ??

All things being equal, though they rarely ever are...mono blocks offer one important element--better channel separation.
Crosstalk from channel to channel and suspect power supplies are the bane of some Stereo designs, hence 'we're dual mono designs' from people like Gryphon.
If nothing else the separation can give a more satisfying stereo rendition...a notable goal.

Larry

Yes, it is the nature of electrical design that they, assuming equal functioning units, be better.

And red cars go faster than blue ones. Always.

Mezmo

That is why they call it arrest me red :)

The issue of monoblocks vs stereo is more than just cosmetics.

Normally, stereo amplifiers share a common power supply. Some manufacturers will go through the extra effort (and cost) to build separate power supplies in the same box, but if single supplies are used, quite often this is audible as a compromise in the amplifier. Even if common grounds are used there can be problems; anyone who has heard the difference between 3-wire headphones and 4-wire headphones will know exactly what I am talking about! (In case that last comment sounds odd to you, there is such a thing as a 4-wire hookup for headphones, and you can hear the difference in a heartbeat.)

Another benefit of monoblocks is that they allow the amplifier to be placed as close to the speaker as possible. This minimizes the effect of the speaker cable. In all cases, the longer you make the speaker cable, the more artifact it imposes on the sound you get (usually less bass impact and less definition- for example vocals can be made out easier with shorter speaker cables).

Of course, this means you may need longer interconnects. If your equipment rack is between the speakers, this may not be an issue at all. I have my equipment rack by my listening chair, so I run long interconnects (30 feet) but the preamp I use has no trouble driving lengths like that.

While there is always the YMMV factor, and while not all things are equal, you *will* find that the stereo amplifiers that sound better then their monoblock brethren are a distinct minority.