After some research i came to this conclusion:Bm will be better than mm in draining games!
Lets see we have a bm chasing a druid..first of all your pet will do all the time 30% more damage and if is los of you(many times) ,it will do 50% more dmg.
It will be like the druid had all the time a big red kitty.Meaning the druid had to heal himself all the time.if he tried to bear then scare beast, aimed shot and TBW.if he tried to cc pet and run away to drink you can use intimidation to stun him or TBW or the ability of pet to be immune in snare.Also if you have hyennas he will be slow all the time and harder to get out of los.(dont forget charge also)
Also bm will have improved stings and scatter so we would be a nigthmare to resto(not as bad as death knights)..and better mana issues with invigoration and aspect of mastery.
In the other hand mm will have chimera shot..yes better draining but there is bad los.
Also he can cc better your pet and run away.Dont tell me silencing shot?3 sec stunned every 45 sec is better than 3 sec silence every 30 sec.
As i see it the problems with hunters in arena were:for BM los,poor drain mana,long cd on the abilities and if pet is dead you are useless.Solved in a way all.los with seperation anxiety, poor drain mana with improved stings, long cd with longevity and glyphs and pet survability with spirit bond,heart of the phoenix and more.
MM problems are los,little dmg when they move and vulnerable to cc.los not solved,little dmg when they run it would be better in wotlk but not good enough.better escape methods from melee now.And better drain methods.But los is los and would be allways the most important thing in arena!