Which is better for mythic +? Marksman or Beast Master?
Thanks for the help 
MM will be better at almost every mythic plus situation unless you’re decked out with the rasz bow and 4piece and itemized well as BM. Algethar academy BM does just as well over all as MM.
That is my experience doing keys from 17-20. Take that as you want
MM is just better for M+. Damage and burst potential for trickier situation. BM is better for single target fights. BM puts up good numbers in tyrannical weeks but not comparable overall.
it’s rare that BM out performs MM in terms of raw numbers, BM only slightly excels in single target and as we know, single target isn’t really the majority of M+ content. You should also consider playstyle to play a big role, I myself enjoy BM over MM just in terms of actually using pets and just the mobility.