Over the years people have debated over which slide is the best for which genre. I play slide a bit and I know what I think is best for what, but only because of what I have tried. I havent tried things like actual bone slides or porcelain.

I was wondering what you think the best slide is for acoustic blues. Im talking about using a resonator and the whole 9 yards.

So what do yall think. And Im actually looking for opinions on these before I buy one, so dont just say glass or brass. Please be specific on what brand and what its made of.
I like Dunlop Bottlenecks (glass obviously)
top axes:
Taylor GS8
Fender American Strat (w/DiMarzio pickups)
Epiphone Les Paul