For Me:
1. Warlock, because they now get animate dead on their spell list, and I've felt for a long while like it's a class that really wants to be a necromancer but can't because it has to wait forever to do any real necromancy. Selling your soul because you dream of becoming a lich king with an undead army makes a lot of character sense, and it has been one I wanted to do for a while. Not necessarily for a long term campaign because an army of pets gets tedious, but next one-shot with level 5 or higher characters I'm definitely going to be tempted.
2. Sorcerer, because they got those alternate ways to use Sorcery points at level 2. None of them are amazing, but Sorcerers now have a slightly less incredibly lame level 2 since they can at least now do something with their sorcery points other than create a single level one spell slot. Even at higher levels being able to cash in sorcery points for a little health adds an extra little dollop of strategic thinking. In any case the first few sorcerer levels are a little less of a slog which makes it much more likely I would play one from start to finish.
3. Ranger, because they finally have level one abilities that makes their level one not just be "a lame fighter with some situational abilities you'll forget before we get a chance to use". Generally there is also more creative space now for a non-stereotypical ranger or ranger multi-class. My urban bounty hunter turned monster hunter will finally come to light.
4. Any character using throwing weapons. Not only has drawing weapons been a limitation, but it also means that every character I've played with throwing weapons I've had to bore everyone by rattling off that I'm drawing a weapon the turn before I intend to throw two. My dagger flinging sword bard may need this.
5. An archer rogue or archer with a rogue dip, because Aim. This would be higher on the list, but it's cheap power-gaming. Also while all the other things I've mentioned have filled holes in the classes, other than giving archers a consistent fallback use for their bonus action this doesn't really do that.