Dealing with snags

I try to use leaders which have a lower breaking strength than my main line, so if I get snagged, the leader will break before I stress out the main line too much.

+1  Or if you need thick leader for abrasion resistance (which I am a fan of doing as well), then I put in a foot of "weak link" at 10lbs. less than my mainline. Using this method you're fine unless you manage to snag up above that, but I've found in those situations that usually by yanking on the braid a few times it abrades sufficiently on whatever it is stuck on to break fairly easily. YMMV.

I've had a bad spool of 25lb power pro that broke ever time I hooked up. 

I have some 50lb braid that had at least 4 different break-offs with 100ft out and still landed 65+lb fish.

When fishing Halibut, you regularly run 100 to 200lb leader. 

-Mark-

I no longer thumb the spool to break-off a snag.  Last time I did it the line dug in so deeply I had to spool out 50 yards of the braid before everything freed up.  Now I wrap the braid around something to break off.

I've had luck "twanging" the line.  It works about half the time.

I use braid as a mainline and mono or fluoro for the leader.  Almost always, one of the knots tied in the leader breaks and I leave very little behind.