I like all masks that aren't dumb.
Jokes aside, I dislike the Great Kaukau and Rau very much due to their lack of eye holes, but that's not the question...
Alright, here we go. Personally, I've always liked the Great Kakama, there's just something about it, and it was carried over well into the G2 versions of it aswell. I also always liked the Noble Miru, it kimd of reminds you somewhat of the Kakama with the cheeks, I guess I just like those cheeks... The Great Huna is another fine mask, but more simple than the Noble Miru. The Noble Ruru also looks pretty good I think, it's simple but effective.
I do find most if not all post-golden era masks are very cluttered, and for some it works, other, not so much... Do I tend to like the 01 masks the most over all.