Or wait StoneSkin, Revitalize??
Since BW doesn't boost his healing I think there are better talent. Still BW8 is great on most heroes and since ww can work like a sniper it will work well on it.
If you have no other targets for that BW, go for it. BW is a good talent for him.
Is Revite or SS better? Possibly, but I don't think it will make that much of a difference, and waiting for a Revite or SS might take forever.
I had bw at lvl 6 because I wasn't able to roll an ss. as soon as I did I swapped it for ss and it is wayyyy better on him. he doesn't really need the bonus dmg not that it doesn't help at all, but the dmg reduction is far superior to a 60 percent health boost and will keep him alive much longer. With the bw I probably spent 30 tries on hbm AG and he always was dead going into round 5 causing a loss. I put the ss on him and brought it to lv 6 as that's all I had and the FIRST attempt at AG again he was full health round 5 and I won. just a lucky coincidence maybe but highly unlikely. That being said bw isn't bad on him but if you can stick it out for a ss I think you'd be much more successful with him.