Soldered LPDDR5x has more bandwidth, lower latency, and consumes less power than the equivalent DDR5 SODIMM. It can also be clocked higher due to signal integrity constraints, and you really want higher clocks with a Ryzen SOC.
If you plan on maxing-out the memory, the only advantage of SODIMMs I see are in repairability. That said, I have verified exactly one bad stick of RAM in over 3 decades of computing, so I personally think the downside of soldered RAM is overblown.
If you plan on maxing-out the memory, the only advantage of SODIMMs I see are in repairability. That said, I have verified exactly one bad stick of RAM in over 3 decades of computing, so I personally think the downside of soldered RAM is overblown.