I think ENCE's era is the best era because they achieved it during highest skill level ever in csgo (skill goes up all the time)
I think it's the best after Astralis. We will see where it will end for big. If u ask the best era ever ? then its astralis, BIG just reached that spot. And I hope they will stay there for a long long time. They deserved that.
Definetly not even top 10 eras, they have played 2 big events in a row and won 2 of them, but thats not an ERA, if everyone had an era every time they won 2 events, there would have been countless eras, mousesports era, navi era so forth, Sadly no.
We must also see that there have been no lans, so skill level has been lower than usual, and BIG has bootcamped both of those tournaments while many of the teams did not boot camp during those..
We must also look at the fact that soon there are another 2 events, if BIG manages to win those, they can have their ERA, if they bomb out they never even had an era.