Both games have all the DLC (bar the IKEA collection for TS2 from I believe).
Both games have the Denuvo DRM for some reason so keep that in mind if you're worried about it. Seems to be a false alarm, EA removed any mention of Denuvo from the store pages.
The Sims 1 will still run at its original resolution, but will now scale pixels to make better use of larger monitors while preserving the look and layout of the game.
Old save files and mods are compatible with this version of the game (TS for sure according to the help page, I'm not certain about TS2).
Edit: Yes, I could use Lutris to launch EA app and verify this game. I know it's lazy of me, but these little unnecessary barriers are annoying; I will just save my money and spend it on a game that opts to not use them like EA is wont to do. As the company can't help itself, as it is trying to emulate the success of Steam but falling on its face.
Happy The Sims 1 and The Sims 2 remaster day, regardless, as EA listened to The Sims community at least!
Does the Sims 2 include all the downloadables from The Exchange? The downloads from Sims Store? The downloadable pre-order bonuses? The downloadable Christmas pack?
As a casual sims enjoyer, it genuinely does feel like they're salty people liked Sims 3 more than Sims 4 and won't release an "everything" version of it.
I don't think they'll remove the Ultimate Collection from people's libraries. The main incentive to buy is... well, the ability to buy the games and the improved compatibility with modern systems - UC doesn't really affect the main demographic, i.e. people who aren't interested or knowledgeable enough to fix those issues on their own.
I've tried to like these games so much since the first one came out back in the day. I've played all of them, multiple times but can never go last one hour. I don't get it. I should like these games!