Choosing between 16-bit and 24 bit ADC
Noise...assuming you design things right, which will be more challenging with the 24 bit. But you don't need it if 16 bits is good enough. Honestly, I see mostly disadvantages since 16 bit already meets your needs. More cost and design effort to get the most out of the part which you ultimately do not need, Might be a good learning experience though. I do that sometimes to see how far I can push it in something where it doesn't matter if it falls short.