Do Mono Block amps provide better sound ??

Essentially yes,  as you will have complete separation left and right channels. 
 Some stereo amps will do better, use judgement and your ears to make your final decision. 
 We went mono long time ago, no comparison for us. 
 To us it just sounds better. With the correct setup. 
 Let your ears do the listening. 
 
 

all else equal, yes

but it never is

all else equal, yes

but it never is

^^^^^This!!!! Hilarious, because: TRUE!!!

They both have their pluses and minuses. (EG: monoblocks can have ground loop problems)

The big one for me is stereo amps with common power supply "can" have better "individual channel dynamics", because all the grunt from the powersupply (that is designed to run both channels) will be directed to that single channel if called for in a dynamic slam note, and hence have a better dynamic response in those instances.

Cheers George

No, they just look cool.