I always say get the most RAM you can afford, I went with the 16/256 model and I'm very happy with it...with that out of the way. It depends on what your habits are, are you going to be using many x86 (32bit) Applications? If so, get 16GB definitely as they run in emulated mode. If you are going to use ARM64 UWP Apps and ARM64 Edge, Chromium Edge or the ARM64 version of Firefox, 8GB should be fine depending on how many tabs you have open.
I use Office365 Pro Plus, Teams Desktop (emulated x86 32bit) and Chromium Edge Canary Browser, then I use UWP apps like DrawboardPDF, Power BI and PWA versions of Twitter, Facebook and Instagram.