I find that people who consider remapping capslock to anything else are people who don't know how to touch type. If you are in that camp I would strongly recommend spending the time to retrain yourself to learn how to touch type with home row position. You'll find that the capslock becomes a much more valuable key. You'll also find that your wrists are happier. It's an annoying time investment,but it's a valuable one. I combined it with switching to Dvorak... which really hampered my typing speed for a couple weeks but also helped improve my wrist happiness.

My keyboard has one minuscule control key so I prefer to map control to caps lock, but I map 'jj' to escape in insert mode, which makes it super quick to switch modes.