As a rogue I hated trees they had too much hp for my build, I leveled on kelpies, then ghosts, then golems, then blackstones at bridge, then golems, then horses, now cultists and wyvd
Pig, was it a health thing or resistance?
My Rogue's nowhere near that level but my ranger's been leveling on kelpies. I did trees too from L97/8-101 but kelpies seems to be weaker to pierce dmg. Not sure if they have less health tho, but my hits definitely did more to them than trees (even trees that were lower level). I've literally seen higher dmg (auto, and sharp) on L105*** kelpies than L102* lol.
P.S. I think it was the same when working in SV (horsies v wisps)