Replace NX Eagle derailleur with SX or GX?

Hi all

First post here, nice to meet you all.

Have a damaged NX Eagle derailleur that needs replacing. Appears to be a lack of stock everywhere until October, so I’m wondering whether downgrading to SX would be a large step down, or if upgrading to GX is more advisable. Does GX work fine with the NX cassette, or would that need replacing? In which case I’d need to upgrade the freehub too…

Considering cost obviously, and I’m not riding more than 40k a week.

Cheers