What is the best Warhammer 40k race?

There is no best race in 40k but how you play and build it, but if i had to say the best of all i would say that space marines are the most flexable and are very hard to beat with simple armies like tau or dark eldar.

if you like shooting llike me then tua or eldar are the best

if you like combat then deamons,tyranids or orks are the best but over all space marines are the most loved and used.