I stated this in another post, but it bears repeating.
I used to fly a 3 kite quiver, based on conditions. Prism Ozone for light winds, mostly flown on 50# lines. A Flexifoil Stranger on 150# lines for medium wind. A Prism Alien for heavy winds on 90#.
Why? Well the design of the kite really dictated the poundage of lines. The Stranger just overpowered lighter lines. The pull it developed seemed to put 90# line at its max all the time. So I used 150# for peace of mind. Similarly, the Alien felt really light on the line and because of the design, didn't put nearly the strain on the 90# I used.
In the end I ended up with a 3 kite, 3 line sets quiver. Allowed for a mix and match situation. I could use any line on any kite - it always depended on conditions,