Should I get 3600MHz RAM for my Ryzen 5 5600X?

Yes, get the 3600MHz kit. The Ryzen 5 5600X’s Infinity Fabric runs best at 1800MHz, and 3600MHz RAM lets it run 1:1 with no divider. 3200MHz works but leaves about 5–8% performance on the table in CPU-bound games and tasks. For the usual $10–15 difference, 3600MHz CL16 is worth it—skip the CL18 stuff unless it’s a steal.