Lemmy and PieFed are very similar, but I think PieFed has many important features that Lemmy does not yet have, and with their focus on better UX I feel is going to make it come out ahead in the long term.
It would be great if there was a Voyager app for it.
I will probably investigate after Lemmy v1 is released, no promises though. Support for two platforms would add a significant amount of development overhead.