Moon Bard -- I always appreciate associations with druids because this is reminiscent of earlier bards in DnD and mythology. I can't expect anyone to not be using Tales of Mirth because a saving throw penalty seems much better than the other options. Primal Lorist should be more clear on whether Druidic includes Speak with Animals like the druid ability does, otherwise it's just a ribbon.
Knowledge Cleric -- I also like the scholarly spellcaster and can see myself playing this as an alternative to many of the bards I've played.
PDK Fighter -- This is bit different for a fighter. I'm going to side with the people who think the name should be indicative of the subclass and not just a name. Updated lore is easy enough and a sidebar is even easier. It's a pet class with some tactical options.
Genie Paladin -- I don't think the idea of a paladin with sworn oaths to genies has ever crossed my mind. The concept is interesting and I don't think the armor options a too much for a paladin. I do think Minor Wish looks excessive at that level. That looks like a lot of auto-success.
Winter Walker Ranger -- I see a lot of flavor here. I'm not sure how I feel about the focus on cold yet, but it is giving me bard vibes of some the those legends. The options look useful enough and there is a bit of dark twist in the flavor that I appreciate.
Scion of Three Rogue -- This seems a bit to focused on the Forgotten Realms with the selection of gods. I would only take a sidebar for other settings, however. I'm not a big fan of the vibe. It seems to go too far on the darker side for heroic adventurers.
Spellfire Sorcerer -- I really like this as a newer and better alternative to the Divine Soul. The full range of cleric spells isn't there, but the important basic healing is. Absorb Spells using Counterspell to absorb Sorcery Points is an interesting mechanic. Crown of Spellfire looks useful even if 7 Sorcery Points is a bit expensive. I might be inclined to burn a few low to mid level spells with Font of Magic to use this ability more often. This might be my favorite sorcerer subclass if it makes the cut.
Bladesinger Wizard -- This just seems to be a bit more streamlined. The subclass takes a slight hit to AC, and pretty much causes the wizard to prepare and spend a slot on Mage Armor but it still going to have a good AC. I don't think Bladesong can be up every combat but it can be up for several of those combats, which means the Bladesinger can play very differently when out of Bladesong uses.
Why wouldn't you play a valor bard if the armor is significant? The difference between a valor bard and a bladesinger wizard is small. The 6th and 14th level abilities are almost identical, but the bard doesn't rely on Bladesong to use some of their abilities.