What are options for SRAM upgrade?

Last time I checked, there was oversupply, which meant you could get very good deals. Therefore the used market was depressed (and prices low).

Yeah, the performance is good on both. I have ridden both, and both electronic groupsets shift significantly faster than mechanical Shimano groupsets (mostly because of the lever throw). Speed and shifting performance is moot and not something that would make me choose one over the other.

This is very personal. A lot of people have complained about the girth of first-gen Force eTap AXS shifters, but I find them perfect as they are. Hood shape and especially button layout feels vastly superior to all Shimano shift levers I have ridden (Di2, mechanical, 105, Ultegra, etc.). But both of these points are very personal.

Yes. One common modification people make is to take a Rival groupset but replace the crank with something lighter (e. g. SRAM Red). That shaves 200 g off right there.

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Is this all I need? I can keep my Shimano cassette, crankset and chain and my giant propel brakes?

And when it says wireless, Im assuming no cables will need to go into my frame?