Former RiFfer here. Although I'm playing with Sync at the moment as I type this, I've gravitated toward Connect quite a lot. It's not Rif but it feels familiar.
IMO none of them are a great replacement. I'm trying Sync right now and am enjoying it. previously I used Voyager, which was really different but felt more polished than most other apps. I really hope we can get a Lemmy is fun someday.
Sync for lemmy is pretty close in my opinion. The layout isn't exactly the same but the different modes (compact, list, tile, big tile) and font sizes/choices can make it nearly identical.
A few things like how up/down votes work is a bit different but not crazy and the interface is really smooth unlike jerboa.
Hadn't heard of this one before, but it looks good. Love that I can fit like 8 posts per page. I don't see a way to jump to previous, next, or parent in the comments, but maybe that will be added.