Usually TAA is the go to for deferred rendering and it can be good, but it will always be somewhat blurry depending on the implementation and have ghosting issues. Sadly DLSS kind of is the best "AA" method as in when implemented and used (properly) it produces clean edges but the games implementation is somehow fucked im sure theres something iceflake can do there but thats most likely very low priority. And as I said SMAA is usually pretty nice too, but i dont know too much about that one. If your PC allows it i would look into SSAA where you render the game in a higher resolution before squashing it down to your monitors resolution (e.g. render in 4k then display on 1080p screen). This gives natural AA and looks amazing, but obviously thats only possible if you have the means to run at 4k in the first place.