Guild Wars 2

This is my build http://tinyurl.com/pdbutv9

For BM/condition build , is Troll Unguent the best healing skills ( even than healing spirit ) ?

Depends on what you do
When I play alone or with people that do not have explosions, I’ll take the Unguent.
If I play with people who have explosions, I’ll play with the source.

And when I expect to suffer from lots of conditions i’ll take the Source also.
You can get some more heal from the Source with the sword (jump finisher), and with good timing your drake will blast in it, giving you some more heal too.

Pvp or pve?

Pvp: Definitely healing spring, your build has zero condi removal, and healing spring is a great heal if you can stay in it for most of the ticks.

Pve: Anything works. Troll unguent would be fine.

TU or HS are both fine choices depending on your preference, playstyle or even opponent.

But as Fomby said.. Since you have no other condition removal I think you are kinda backed into taking HS.