I've not actually played but since I've wrote homebrew subclasses and converted them 2024, TOTV, and A5E I have a semi-decent feel for the changes, at least on paper.
I think TOTV is going to feel like a lot more like a 2014 game with a moderate power boost to the baseline and a slight nerf to nova. Smite and Stunning Strike both got nerfed and the Monk's buffs are honestly pretty limited compared to 2024. Fighters, Barbarians, and Rangers get significant boosts, and everyone can take an ASI and a Feat Talent at each level. But there's nothing like Weapon Mastery where you get a rider on every hit. Weapons do get some options, including something that might actually make the sling situationally optimal, but unless you're a particular Fighter subclass you have to choose between weapon options and damage for each hit.
Niche protection is enforced a bit more strongly than 2014. Talents are siloed off into Martial, Magic, or Technical by default, though some subclasses get access to more than one list. It also has four spell lists instead of one for each class. The bad news is that spells haven't been adjusted as much, so problem spells are still pretty problematic. There are a few judicious nerfs and buffs but not as many as 2024.
Rituals is another thing I'm not sure about in actual play: each class that gets them chooses them separately from their normal spell lists. The upshot is that you will know more rituals + spells overall, which is effectively a flat buff to casters with rituals.