Personally, I really liked Zephyr, but I had some issues now and then. Overall, AOSP roms seem to feel slightly snappier than LOS. Now, LOS can have an occasional slowdown, but I would get outright bugs/crashes with Zephyr. It was the only AOSP rom that i could actually get GPS and speakerphone working at the same time, but there were other instabilities. So I chose the prehaps slower, but more stable LOS. I've also been able to minimize that occasional lag with a custom kernel and some related tweaks.
As far as features they are somewhat similar, but I think LOS probably has slightly more features (baring substratum install, of course). In some cases they have different features though, so not everything translates between them.
All of the MM roms have the potential modem issue with GPS/Speakerphone, so you may need to play with that if you encounter problems. I'm now trying to play with Gapps nano to keep things leaner, and seem to be having some success that way too! Also, if trying to root, I highly recommend trying Magisk over SuperSU; there's a ton of flexibility (and Magisk Hide is awesome!)
Make a backup, and then maybe give it a shot! I find myself really enjoying it!
