Depends on what is most important to you.
4 element - More Side/back end rejection and gain with a narrower beam angle
3 element - Wider beam angle with less gain and side/back rejection.
Since you want to run 11m vertical and 10 flat, it kind of rules out a Quad or Star type beam.
I would say a Comet for a 3 element and a Shooting Star for a 4 element.
I was looking at the Maco shooting star, but I wanted to see what other people had to say. I may have to abandon the 6m beam, I have a second tower I could put up. Thanks for the suggestions.