I have the ’21 Spec Epic Evo, had the Brain version previously that I had Evo’d as a custom build. New Evo is so much better as an all ’rounder. On single track that you describe I think it climbs as good as my Epic HT (IMO) – maybe a touch better due to a little give over the chatter. Then when its time to roost unlock one or both ends and let ‘er eat. And they got rid of the Horst link out back – one less pivot bolt and a little weight loss with those pivots (and the Brain). Never ridden any of the others but have seen plenty of the Pivots on the stand in my LBS: always the same thing – replacing pivot bearings and bushings (I see several Evils in there on a regular basis as well). I think simple is better in the long run. Several buddies have made the switch from Pivot to Spec with the new Epic. Either of the Yetis is a square deal too!