Actually the EVO version offers better build quality than the standard version. It offers 6+2 VRM design compared to the 4+2 VRM of the normal version and also offers more number of solid capasitors. As a result they it can handle more voltage and power. Even if you're not overclocking, the better build quality offers more stability and longer life span.
So, EVI is a better built board and is more stable, but is the non EVO lacks anywhere? I'm asking this because he (my friend) is already at the bleeding edge of his budget and if he asks for even 1k omore, the whole pc may get abandoned