No follower mods here. But J'zargo is one of my fav for his lack of max level and his personality. Mjoll is also great, especially on Switch, as she's essential so I don't have to worry about blasting her accidentaly with my magic and leveling up to lvl40 she's not too useless. She's also one of the few with many comments based on the location, so more fun to travel with.

All dogs are also great, because dogs. But only on PC where I can use commands to make them essential. Blasting them into accidental death just makes me sad, so I tend to get kids just so they can adopt the dogs when playing on Switch.

You didn't ask, but the worst to me is Serana. I have no clue why she's so popular (well I do but....). All she does is complaining about everything and acting depresive. She's just so annoying to me.