With the recent updates to Next there isn't enough differentiation between the two IMO. Given that Next has huge buy-in from the JS ecosystem, choosing Next is a better bet. If Next had come out with their new updates a few months ago then I wouldn't have picked Remix.
I don't regret using Remix as I just wanted React Router + easy SSR, but it's also because of this that it wasn't very differentiated.
Having used both, if you already know NextJS well then I wouldn't bother switching to Remix. If you want some of the Remixy API-niceness in NextJS land then you can use tRPC (for example, there are probably other options).
Nothing against Remix, I do like it, it just isn't differentiated enough from NextJS to both switching for me - yet, at least.
For work: NextJS, because Remix's future is now a little less clear. Also, there's 10x the help and documentation for NextJS. NextJS is where the mindshare is, for better or worse.
I don't regret using Remix as I just wanted React Router + easy SSR, but it's also because of this that it wasn't very differentiated.