Re: Replacing 5/16 genoa sheets
I like XLS or NE Ropes Sta-Set pretty well for genoa sheets. It's comfortable stuff in the hand. 3/8" or so works well. I like to put an eye splice in the end (either with spliced in dyneema tails or just into the double braid) then attach it with a small soft shackle to get a fitting that isn't dangerous and that won't hang up on shrouds.
Trophy Braid has a very different casing that I don't like as much in the hand. It also absorbs water like nothing else, which means the sheets get pretty heavy if the lazy sheet ends up in the drink.
MLX is very expensive for this application.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior