If you want relatively cheap RAM (Samsung B-die is twice the price, roughly):
Around 100 $, 16 gigs
Ballistix 16GB (2x8GB) DDR4 3600MHz CL16
Kingston Fury 16GB (2x8GB) DDR4 3600MHz CL 16 Renegade
Around 200 $, 32 gigs
Ballistix 32GB (2x16GB) DDR4 3600MHz CL16 Black
Kingston Fury 32GB (2x16GB) DDR4 3600MHz CL 16 Renegade
All of those kits most likely are using Micron chips, Rev B or E. I would lean towards Rev B. I have Rev E and out of the box it is 3600 Mhz @ 18-22-22. I have it running at 3800 Mhz @ 16-21-16, Kingston Fury Beast. I would have liked Crucial Ballistix but none was available at the time.