Seege,
All the 'quirky' features of the 'fancy' fly lines, 'bass tapers', 'clouser' lines, etc., are just another way to get more WEIGHT into the forward portion of the line to help with casting wind resistant or heavier flies efficiently.
Plain old weight forwards work as well. Get a good one.
How you decide what WEIGHT is more of an issue than the 'brand' or how a line is 'described' beyond simply being a weight forward. Please don't just buy the 'line that matches whats printed on your rod'.
For your 6 wt. rod, assuming that IS actually a 6 wt. (they often aren't now days), for 'general use': This means that you seldom cast long distances (over 90 feet), most of your casts are OVER thirty feet, you seldom cast very heavy or truly big flies (over say about 3/0) and want some 'delicacy' if you get near a trout stream. For that, a WF6F is hard to beat.
IF, however, you are mostly bass fishing from a boat where you can make shorter casts the norm, fish in wind some of the time, or throw big flies, and need better control/acuracy, then going up to a WF7 or even a WF8 will serve you better (THAT is basically what those 'fancy' tapers do for you, give you a 'heavier' line).
You CAN, of course, buy the 'bass taper' or 'clouser', or whatever name they have this season for a 'heavier' style line. They will work. You just don't HAVE to to get the same results.
Good Luck!
Buddy
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