No context, no budget, no specific links to the particular kits you’re considering, etc, etc

Enough ram for 99% of people or even more ram? No downsides no nothing, just the price difference, just decide yourself lol

If you don’t know which one is better then it means that you don’t need more than 32GB of RAM.

for overclocking 24GB hynix M-die dimms are best but they generally cost almost twice of Adie 16GB dimms. It’s easier to hit 7600+ with these, specially on 4 DIMM boards.

There are 24GB dimms from micron on the market as well, those are not good for high speed so watch out what you are buying.

16gb Adie is better value right now, You can get a kit for like $100. Higher capacity dimms are just newer, better and cost more than a over year old Adie. Something better probably comes out next year, it’s a rapidly evolving segment.

TIL, there are DIMMs now that are not powers-of-two.

More is gooder

Well 48GB > 36GB and without any other context, that’s all I got for you

Assuming there is no budget and that both Kits are running the same speeds and latency, I would say 2x24gb