Yeah that's a great question...I'll probably be starting Elden Ring maybe this weekend? So I'll have more to say on it after that, but it probably comes down to what you're looking for. Yes, Elden Ring was made by From Software who did Dark Souls 1-3, Demon's Souls, Sekiro, and Bloodborne. I've talked about it in here before, but I bounced off Dark Souls 1 and Bloodborne but Sekiro is one of my favorite games of all time. So I think it depends which one might click and which one might not.
The difference on this game is it sounds like you have so many more options on what you can do...it's 'open world' Dark Souls. So if you run around and find a boss that is an asskicker you can just go fight something else instead of bashing your head on it over and over. I've been trying not to watch other people play it to avoid spoilers but that's the thing, there are so many people playing it including people who normally don't play those types of games. I think that shows it's more accessible than some of their other games. Still tough, I'm sure, but you have more options this time.
Horizon has a lot of similarities and I'm sure there are reviewers out there who just said it's another Ubisoft-type gigantic map with a bunch of dots type of game but I think it's more than that. It has a big map with a bunch of stuff you can do but it doesn't feel repetitive. There are a ton of different environments and there are so many different ways you can play in terms of combat/weapons/etc.
I really feel like these will be two of the best games all year so if someone can I would recommend getting both of them, but I know that's not always possible. I feel like I'm going to have a hard time picking one over the other in the end