Do Mono Block amps provide better sound ??

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.

In my case it was a huge improvement. My Thiel CS3.7 require a lot of power. I had a single Benchmark AHB2 in stereo and it provided around 250+ at 2 Ohm. It sounded under-powered. So I got a second AHB2 and switched to mono mode on both AHB2's to give around 500 at 2 Ohm range (though not officially rated for that). The sound improvement was easy to hear. More bass, more power in my hard rock music, just better.

I was also able to buy a real amazing, but expensive speaker wire, using the mono's because I could keep the amps right beside the speakers and use a lower cost length. I use 15 foot XLR interconnects that are not as important as the speaker wire. The XLR's cost about $200. So the monos made the speaker wire more affordable for me.

So I got a second AHB2 and switched to mono mode on both AHB2

Amps that are bridged are not true monoblocks, bridged stereo amps grated get the better single channel power supply I mentioned above and have more wattage than when they were stereo, but all other measured parameters take a hit with bridged amps. I’d far prefer true monoblock amps.
I think the better way with the 3.7’s would have been to keep the AHB2 as stereo on the bass, and have something like a Class-A Schiit Aegir on the mids and highs, no bridging involved then.

Cheers George

I run both a stereo amp and mono blocks, not at the same time. The stereo amp is excellent and offers the following advantages...a single amp stand, a single power cord and the ability to hook up one subwoofer with no issues. It also takes up less space ( slightly). The mono blocks offer these advantages ( and they have mostly already been mentioned): better separation between instruments and slightly more depth, all of the attributes that Ralph pointed out above and greater flexibility of placement. For ultimate SQ--I think it is mono blocks, for less expense, it is the stereo amp.