To me, none of the strokeplay courses.
Merion is a bit tricky but that's the way it is...
I really dislike the CTTHs with too many water shots in them - chance to lose more than one ball during nine shots, and the second and sequents will be new balls!
Too much at stake for me!
BTW: I never disliked any real course, almost... There was one which was nothing but a meadow treated with a mowing tractor (alas cheap), but to all other courses (and there were quite a few) I would return.
One nice course in Portugal is on his way to earn a "no return" for spamming me with their ads despite several notices of disapproval.