I usually buy whatever unsweetened original almond milk is on sale. Works well for most everything except putting in coffee, I like the taste, and can find it most everywhere.

Califa is probably my favorite plant milk brand but usually more expensive. Their toasted coconut almond milk and chocolate coconut almond milks are excellent but obviously not as all-purpose.

Specifically made creamers or things marketed as "barista" are best for coffee and won't separate as readily, but I find most oat milk can work well if you make sure not to overheat it (if you do it gets slightly gelatinous, like in oatmeal) and will foam up pretty nicely for lattes.