Originally Posted by Orion3
When I was playing with open string pattern hybrids I gradually migrated from 17g to 15g mains. You do lose a little power, I can't honestly say I experienced a noticable change in control or spin, but durability was significantly better. Comfort was great too.
I've been playing 18x20's for a while now and because of the dense pattern, strings seem to last much longer - not dropped below 16g gun mains.
For me, 15g was a significant drop compared to 16 and 17g and durability was only about 20% better. Given I don't break strings that often, it was an easy choice to stick with 17g.