What is the performance difference between Ullman and Landerberger?

Usually the nut pulling the strings!


What's up with the wrinkles showing in both sails above? Not enough batten tension?

I'd say probably not enough luff tension (or to much main)
although the battens in the cat rigged one appear to be almost "S" bending? which could indicate (among other things) that the battens on that one, at least, are not heavy enough?