FWIW, here is my spellcaster summary at level 1 since it seems to be the "hot" topic:
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IMO, (as much as I dislike them in general), Bards rate well. More skills, good known spells, ritual casting, medium or better in all three pillars potentially, and bardic inspiration
Clerics rate well due to high number of prep spells (even if some are predetermined), ritual casting, medium or better in all three pillars potentially, and subclass features.
Druids rate a bit lower, but still have a good prep spell list, ritual casting, two strong pillars potentially, but Druidic is valued lower IMO.
Note: all three have ritual casting, but to use it a spell must be known or prepared, which makes their ritual casting underpowered compared to wizards.
Sorcerers rate a bit lower even though they have great cantrips, but are weak typically in two pillars. However subclass selection can be huge for them in bumping them up!
Warlocks also rate a bit lower despite having potentially 3 spell slots or more depending on short rest availability and being decent at combat. I don't find their subclass choices as powerful at level 1 and wish their Expanded Spells were automatically known to them (we use this house-rule actually) as it would definitely bump them up.
Wizards rate well for decent cantrips and prepared spells. Arcane Recovery can help if a short rest is available. Despite their weak ratings in physical combat, exploration, and social, they stand out (for me) because of their strong ritual casting. With 6 spells initially, they can cast ritual spells
without having them prepped, so depending on spell selection they potentially could have all 6 spells available to them. Only the cleric has the potential (with WIS 16+) to match that.
Now, all this is my personal take on how I rate things. For enjoyability, I like Wizards the most and Druids second. This is just because I prefer the flavor of those classes. I can recognize Bards and Clerics as good (and play Clerics 3rd most out of casters), but don't generally like the flavor of bards and find clerics a bit one-dimensional (maybe that is just how I play them?). Sorcerers can be great depending on subclass selection (without XGtE, they fall IMO), and Warlocks are just lack-luster at Level 1 for me.
I know we all have our favourites and personal preferences, so I think they can all be enjoyable depending on what you want.