For braid, I like both the Sufix 832 and Seaguar Kanzen.

For straight fluorocarbon, I like the Seaguar Invizx, but a cheaper alternative is the Yo-Zuri Hybrid.  It's not 100% fluoro, but has similar characteristics and is more abrasion resistant.  It's like P-Line, only better.

Flourocarbon:

Go with Yozuri H2O, or Hi-Seas Quattro. The Yozuri is a little more wiry but incredibly indestructible. Take It from me i catch big fish on it all the time. The only knot I use with it is the Palomar (with some spit) Trilene, improved trilene or clinch type knots tend to fray it, when tightening up the knot; no matter how much spit you put on it. 

The Quattro is a little softer and more managable line that is not one solid color. It is 4 different colors that breaks up the visual pattern of a solid line coming from the surface, and blends into the surroundings. I have not yet found a knot that doesn't work with it. It's a little more pricey but you can find it on Ebay or TW sometimes on sale. The bonus is it is thinner and is made in a camo pattern so you can upsize your line without the fish knowing! I love this stuff! I'm still experimenting with it on the big ones tho. I don't think it has the brute strength the H2o does. But feel free to upsize a couple lbs of test if you want the fish won't even know it's there.

Braid:

POWER PRO. It's round, it's what you want. Tie a palomar. Check your knot every once in a while for frays re-tie when you see your line fraying.

When using braid fill about 1/3 rd of your spool with cheap mono. It will save you money and line and time. Braid will tend to dig into your spool more if you don't; and it actually can slip around your spool.  Meaning your spool is stopped but the entire spool of line is spinning around the stopped spool.

Don't buy cheap Flouros. they suck I've wasted a bunch of money trying to find a good cheap one. There isn't one. I've tried Suffix I have to say it does not compare to either of these lines.

And remember even a "soft" flouro is more wirey than your toughest mono. That's why you don't wanna put more than 8lb on a spinning reel. If you wanna use a higher test spool with a 20 or 30 lb braid and then tie on a flouro leader. You can use as heavy of a leader as you want but anything higher than 8lb on a spinner tends to be unmanigable. It will twist up alot and cause you headaches when you cast.

I've been trying the new Seaguar Smackdown braid and, man, I'm impressed.  Really good stuff so far.  I'm looking forward to putting it through the paces at Potholes.

And to the point above, I use 6-lb fluoro on my spinning reels.  Although I have been testing 10-lb braid on one setup for specific techniques.

I should correct myself.  I'm using 6-lb Yo-Zuri on my spinning reels, not fluoro.  But on baitcasters, it's basically fluoro except for flipping/pitching/swim jigs.  Then it's braid. 

One exception is my spinnerbait rod.  For some reason, fluoro and spinnerbaits are a bad mix for me.  I performed a few 400 yd casts before I switched to Yo-Zuri. LOL!

Note too, that braid and rocks aren't a good combination. Don't ask why I know. 

When you spool the braid onto the reel, really crank it on there tight - I mean hard tight.  Your fingernail shouldn't be able to penetrate the line on the reel.  It should feel solid.

If you do that, then the braid won't dig in and backlashes will be manageable.

On spinning gear, do you use braid to flouro leader or straight flouro?