Completely unrepresentative though, since the single 16GB stick is not working dual channel and is hence at half speed. It’s a terrible idea to not mount memory dual channel. You’ll need two 8GB sticks for comparison.
I did a thread a while back on whether you need 32GB RAM: Do you need 32gb RAM, and if so why?
The answer to that seems to be no, not really, not anymore since it’s now optimized to run with 16GB.
OP should note that DDR5 is actually slower with 12th Gen Intels than DDR4 is. If you are going for DDR5 now, then that is only for sake of reusing it with some different system in the future, otherwise you’ll be paying more for less. And future proofing right now (or at least the last I checked DDR5 prices were quite high) might not even make sense.