What's the best ink to use for t-shirt printing?

I've found out that iron-on transfers don't last long, according to what most people say, so I'm thinking of silkscreening or directly painting on the shirts. I'd like to ask what's the best kind of paint to use on fabric? All I know is textile paint, but I've been hearing a lot about acrylic. Any pros and cons for the two? And any other paint suggestions? Thanks!