I enjoyed my muscovies, but I didn't end up getting more after they were killed. I've had a few mule ducks too; they were also neat, but not my thing.
Mule duck... Starburst.
As for the LF breeds, I'd vote for Welsh Harlequins. They are docile, good layers, personable, and beautiful. I had a trio years ago that was the light of my life. Unfortunately, their time was cut short by a mink, but while it lasted, I adored them.
I'll second Calls. In my limited experience, they're not too hard to keep grounded by clipping their wings, & they don't seem too motivated to get out of pens. I have 4.5' fencing that I haven't had issues with. They are a lot less messy than their larger counterparts, quite cute, and make good...