This is great, Michael :) One question before I buy...
I'd like to use these to do development work like you suggested, too. Is the Hacker option the build with the best latency/least issues (set it and forget it)?
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Honestly, the overhead from TinyPilot is so small that it's just a question of how powerful you want the device for other activities.
Here's a screenshot I took earlier today on a Pi 4 with 2 GB of RAM. TinyPilot is streaming video over WiFi, and top shows that it's only using ~4% of CPU and ~2% of RAM: