That’s pretty accurate, thanks 
Just wanted to add one more thing concerning RAM when making your choice. 2 SODIMMs can use dual channel then if the two SODIMMs are of the same type. This can be beneficial if you run applications that need a of memory bandwidth or if you run one or multiple high res screens at high refresh rate. Since the DDR4 RAM is also used as video memory there will be more bandwidth left for the system.
But also take into account power consumption. DDR4 RAM consumes quite some power and using two SODIMMs increases power consumption quite a bit (I can not tell exactly how much though).
So it’s a trade off - more RAM bandwidth vs. less power consumption
Cheers
nicole