Which is better is going to depend on your personal goals/targets and all that jazz...
-wanting one of the top dogs or something comparable
-money is no object... or maybe it is, since you're also considering a more affordable model
-care about that ray tracing, or maybe you'll try it out a few times and be done with it, at least until it further improvements
-DLSS Vs FSR...
-utilizing Shadowplay or Nvenc, Vs the AMD equivalents
Performance: 6900XT trades blows with the other 2 in regards to rasterization performance. It's Ray tracing and DLSS alternative is lacking. If you are only going to play a single title, it would be best to look up benchmark videos comparing the gpus.
Secondary features: Shadowplay, Nvenc, etc, are more user-friendly than the AMD alternatives, or so I've heard, so if you're going to make use of such features, it's something to consider.
Cost: 3080 12GB would be cheaper than the other 2, while still having relatable performance. 3080 and 3080Ti are going to heat your room up a little faster than the 6900XT - and it's not because of the AIO. Power use has seldom been a concern, but there are times when some complain about their room getting hot, so I thought to bring it up anyway. I live in a subtropical climate, so it's a little more important with how lousy the summers can be.
A downside with the Toxic model is getting the cooler replaced when the pump inevitably breaks after warranty, but you'll probably have replaced it with another gpu before that happens.
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