I have the 2021 Epic Evo and the 2020 Epic. The 2021 Epic has more slack geometry than the 2020, and I haven’t ridden the 2021 Epic, so keep that in mind.
My 2 cents, and others may disagree, is I would base your decision more on the type of terrain you ride and whether you want a remote lockout in the rear, not necessarily how long you ride.
If the trails you ride are pretty tame, and you are going to be doing some racing, I would go with the Epic. If you are riding terrain that is more technical where you would benefit from having more travel and more slack geometry, then I would get the Epic Evo, or if you are racing in more technical terrain.
I use my Epic for the majority of the rides I do near my house and for the majority of the races I do. I use my Epic Evo when I go ride trails that are much more technical or are flow trails where I benefit from the increased travel.
There is a difference between the rear shock and feel of the Brain and that on the Epic Evo with no lockout. For racing and riding hard on non-technical trails, having the Brain (or a remote lockout) is really nice. It’s not very practical to flip the lockout on and off on the Epic Evo while you are riding. The Epic Evo does have a more upright feel to it than the regular Epic.