For me, the RX 6900XT is the better card because I have an HP Reverb G2. The VII was simply not fast enough.
SAM gives you an additional speed advantage.
However, the card is simply not available at a reasonable price at the moment. The only rational thing to do would be to buy the card directly from AMD if you can get it there.
If you are satisfied with your current card, I would keep it until the market has calmed down a bit.