Should I prioritize dual-channel RAM or faster RAM speed for Ryzen?

Prioritize dual-channel RAM over speed. Dual-channel gives a 10-20% performance boost in games and productivity, while going from 3200MHz to 3600MHz only gains 3-5%. Two 8GB sticks at 3200MHz will outperform one 16GB stick at 3600MHz. Once you have dual-channel, 3200MHz CL16 is the sweet spot.