PCB design questions

Still ~80x100mm, using 2 or 4 layers? 4 layers cost more (e.g. FR-4 Black 100qty, 2 layer ~$0.47 per board, 4 layer ~$0.95), but only slightly more when full board parts/assembly is considered. Would routing proper Grounding/Power and signal return-paths/shielding for signaling be easier with 4 layers, minimizing interference, with a good layer stack up ?

Curious what PCB designers here recommend? Would be nice to see this board be useful for various scenarios, but am not expecting to be used for everything. e.g. Someone working on mostly printed electrogravitic propulsion build may want to consider an alternative more heavily shielded board design.

Coming from a guy who graduated in comp sci + AI + electrical eng ~25yrs ago,
watched a bunch of PCB related YouTube videos, and has only made 3 fabricated PCB designs, and one of which was a Pioneer Sat plaque inspired beer coaster…

Am most creative when taking a drive, stroll, jog, poop, shower - Basically any time and space where mildly physically occupied, but cognitive bandwidth is free to wander uninterrupted towards an idea, or beyond a local maxima we’ve overly tunneled visioned into.

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