I'm thinking about either 15lb fluero or 30lb braid. Which one do you guys think is better?

What techniques you going to use it for? That determines whether I use FC, Hybrid or Braid...not what reel I'm using.

As has been said, we need more information. These things all factor whether I use braid or some form of fluoro/mono/hybrid:

 

- Technique (moving vs stationary bait)

- Cover (weeds vs rocks vs wood vs open water)

- Rod action (XF, F, MF, M, etc.)

Would never go lower than 50 on a baitcaster 

I use my Curado DCs for jigs mainly and in fairly clear water with lots of rocks.  They are always spooled up with fluorocarbon line.

I use 60lb maxcuatro on mine and depends on technique I add different leaders or I dont(in case if I want to use straight braid like for frogging). 

I use 30# braid on mine. For slinging spinner baits, chatter baits, swim jigs. 

I have used 12lb and 15lb FC. Both worked great.

I use 12 pound Sufix Siege on my Curado 200i 

I have a couple of those reels and I think that right now I have 30lb braid on one and 40lb braid on the other.

 

That being said, I prefer braid on all of my baitcasters and will use a flouro, mono, or hybrid line leader if conditions and technique call for it.