Both memmy and mlem have been great in their own ways thus far. Both are in testflight and getting regular updates, in addition to the news about sync there is also news about another new one called artemis that is aiming to be apollo styled.
I’ve been testing both and I definitely prefer Memmy overall. Mlem has better image display options and has search. Memmy doesn’t display images unless you tap on the post. Search should be released in the next day or two, though.
Artemis being an Apollo clone had me very excited, though.
Edit: new app just released on TestFlight showing real promise: Limbo