What is your guys opinion on the best braid fishing line in 15-20 pound test. Also I want a braid that is smooth to reduce wind knots

I love fireline in 15 pound, and grand slam as well, in 15 or 20 or even higher.

Nanofil is about as smooth as you can get and works good on spinning reels. Otherwise I would suggest sufix 832 

Sunline sx1

i just spooled up some 20# suffix 832 and my first impression is that it is a lot smoother than power pro.  Haven't field tested it yet.  I also haven't tried a lot of braided lines so I don't have much to compare it to.

What is your guys opinion on the best braid fishing line in 15-20 pound test. Also I want a braid that is smooth to reduce wind knots

Smooth and wind knots are not related.

^^^ What Snook said ^^^

In reality, you'll find that most brands of braid are quite similar, it boils down to personal preference.
I've used Power-Pro Braid for several seasons but eventually switched to Berkley Trilene Braid (I won't go into detail)

Trilene Braid consists of 8 braided strands similar to Sufix 832. However, Trilene braid is not offered

in 15-lb test, so I have one outfit rigged with 15-lb Sufix 832.

 

Roger

The stiffer the braid the fewer the wind knots you will get. If you can find a braid with a coating it would reduce your wind knots compared to a super smooth braid without the coating. Suffix performance braid might help with the wind knots. 

i just spooled up some 20# suffix 832 and my first impression is that it is a lot smoother than power pro. Haven't field tested it yet. I also haven't tried a lot of braided lines so I don't have much to compare it to.

suffix 832 is smoother than original power pro because it is an 8 carrier, the super 8 slick power pro is a smooth as it gets! Lol

Fins wind tamer?

Fins wind tamer?

 

Not a bad line at all.

 

I get quite a few wind knots when I fish fresh water, hardly ever when I fish salt.  I can't prove it but I think this is the difference.  I have seen videos where the line hits the first guide causing a wind knot.  Fishing salt water I generally throw a heavier lure, I think it keeps the line straighter coming off the spool.

Are you putting it on a spinning reel or casting reel? 

 

For me Power Pro Super Slick has been great on a spinning reel.

The stiffer the braid the fewer the wind knots you will get. If you can find a braid with a coating it would reduce your wind knots compared to a super smooth braid without the coating. Suffix performance braid might help with the wind knots. 

 

I agree with Dwight, 'stiffness' rather than 'smoothness' is what reduces wind-knots (if that's your concern).

For this reason, the heavier the 'line-test' the stiffer the line, the fewer the wind-knots.

I use '30-lb' braid when I'm serious, so wind-knots and line-burrowing aren't an issue,

even with limp Trilene braid, another 8-member braid.    

 

Roger

832 Sufix