I have 3 machines: 1 work MBP, 1 personal MBP, and a windows desktop for gaming.

I tried several solutions but recently purchased a LevelOne Tech KVM. Best solution I've found thus far (albeit a little pricey).

https://store.level1techs.com/?category=Hardware

Find the 4 port option which works best for you (single or dual display). This thing has been bulletproof so far.