Tox,
They all seem to have properties that make them different form each other, i havent found the prefect one yet. I played with lots of different braids before i figured out what i like the best. Here is a list of what i have found with the ones i have used
Original Sipder Wire. pros: Casts good, very tough, works very well in rocks. Cons: tends to flatten out and "cut under" itself when you set the hook so on the next cast the spool stops dead when it hits the spot where the line has buried itself.
Power pro. Pros: Casts well, dosent "cut under" very much, stays round. Cons: Cuts very easily in rocks, noisy when it runs thu the guides. Tends to be very stiff in the 40# and up weight.
Stren Super Braid. Pros: Very Limp, stays round, dosent "cut under" much, decent in rocks. Cons: Didnt cast well at all.
Fireline Pros: Casts well, seems strong, cuts easily in rocks. Cons: Black fuzz evyrwhere even inside the reel.
These are just my personal observations. My preference is for Spiderwire orginal. I like to use it on my c-rig rods and its the only one i have found that is really durable near rocks(something very important to me) and i can overlook its one real shortcoming. I just wish it was easier to find these days