I'm thinking about buying the 16 as I want a new Linux-compatible laptop and I like the whole idea behind Framework. I do a little bit of gaming but honestly just what my Steam Deck is capable of, so I was planning on buying it without the GPU for the moment.
Looking at the two processor choices, they seem very similar on performance. I'm not sure I can justify the $200 price difference, especially with the hope of a future upgrade to a newer generation.
From what I can see both the integrated and dedicated cards are the same no matter the processor. That said, I know Intel used to call every iGPU for a generation the same thing and they would have significantly different GPU performance across different professors, so I don't know.
If they're the same, then I'd get the cheaper one. There are likely specs somewhere that list the number of compute units in each for you to double check.