Those are some of the main reasons. Also, the fact that it can be easily released as an Android build as well is nice, especially for users who would want a more Apollo-like feel on android devices. I have not personally tested Jeroba, but from screenshots I have seen (while it does look great!) it doesn't have the same look as some of the old Reddit apps.

Bottom line is this is a huge preference thing. I don't want to take anything at all away from Mlem. If you know Swift and think you can contribute to that project then by all means you should! Looks like a great project. Glad that there's so many people working on things for Lemmy already!