Posted 22 May 2012 - 11:20 PM
For outdoor use I have 20, 30, 50, 80 and 120 (yes, there is a pattern there) line sets in my bag.
The 20's don't see much use, but the rest get flown lots. My choice of length (Laser Pro is my brand) comes down to where I am flying (space available), who I am flying with (what do they have) and if I'm flying solo, what type of flying do I want to do. Because I only fly 90# line the wind speed also has some bearing on my choice of length, but that is partially tied in with what type of flying I want to do.
The 120 is the standard for team flying, but I have flown pairs on my 30, 50 and 80 as well because thats what the other guy had. For solo work, the 120 make for a much bigger window and really slow things down for you so you can think between things - I use them for big slow solo work.
The 80 set is used by me in wind where I want the bigger window but the 120 set creates too much line drag and slows things down too much for what I want to do. I can still fly the 120 in this range, but it's slow and steady and I'm in the mood for a bit more punch to my flying. Obviously this is also my 'short' long line set for when space is an issue.
The 50 set is my long short line set and probably one of my most used lengths for me. This is largely due to the depth of our beaches here (80's would often be a very tight squeeze) as well as as being used for low wind and solo work. They're quick to set up, give a reasonable wind window, still allow 3D work, fit into smaller spaces, get you closer to the objecst or people you're playing with, etc. For me they're just an awesome length to fly solo on.
The 30 set is also a very well used set for me. It makes small spaces into big spaces, is my favourite set for catches, brings you up close and personal for interactions, gives a lot of punch and flair to solo work, super fast to setup, great in light wind, teaches you lots by being able to see all the details of whats happening with the kite and is perfect for urban flying.
Your conditions, preferences and needs may vary so apply to your own conditions.