$1800 RTX 2060 Laptop v $2400 RTX 2070 Max Q - Single Channel

Most laptop manufacturers ship their RTX gaming laptops with single channel RAM. Some put people off doing upgrades by using warranty stickers and some have the RAM under the mother board like the MSI GS65 Stealth and MSI GS75 stealth making RAM upgrades harder. RTX 2060 laptops can be about $600 cheaper than RTX 2070 Max Q laptops, so how do they compare in a single channel configuration? I used the Dell 5 RTX 2060 and Dell G7 RTX 2070 Max Q for my tests, both with the same BIOS and 1 x 16 GB DDR4 2666 MH