vishal-
running a quick look at the specs, the EVO model also has eSATA port and firewire(1394).
This is what i found in the features list for the ASUS M4A87TD EVO
8+1 Phase Power Design
To fully unleash the AM3 CPU´s potential, the ASUS M4 Series motherboards have adopted a brand new 8-phase VRM power design.
It delivers high power efficiency and supreme overclocking ability.
Furthermore, high quality power components can effectively lower system temperature to ensure longer component lifespan.
This series also features an extra 1 phase power dedicated to integrated memory/HT controller.
All that is pretty self-explanatory and also universally applicable to motherboards/motherboard design in general.
Overclocking/24x7 use or not, more phases is always better for the above mentioned reasons afaik.
Simply put, one should always prefer getting a motherboard with beefy power phase circuitry imho.
vwad-
I have usually not seen many complaints about the mid-range and esp high end offerings from ASUS.
There might have been some issues with entry-level mobos at one point of time.
Everyone has their ups and downs and the nos may seem high even if the percentage might not be, as the volume of sales for ASUS has always been very high.
At one point of time some years back, almost everyone i knew had an ASUS motherboard.
ASUS has some very good boards in terms of features and quality.
If you do find anyone having issues now, please do start a thread for the same with all details.
Low Quality these days. Old reputation gone now. 
