I use green and brown pretty much interchangeably. They’re both more chewy and have a more defined taste. I think the green are a little more savory and the brown can be a little more peppery, but that may just depend on the stock you have access to. They’re good in long cooking stews or bolognese. I like the brown in lentil salad. Split lentils have a lighter taste and cook faster. Red split lentils are good for a quick soup, chili, or pancake/lentil omelet. You can always make a dal, dal is always amazing. I never regret dal.