Poll: phpt or phpunit and why?

HI, When writing tests, do you use phpt or phpunit? (or another one?) Why do you use that one? Let's share the idea. I like both, but when I write simple tests, I prefer to use phpt because it's less code and easy to write. I use phpunit for tests of complex classes. I can do that with phpt, but to me phptunit is more easy to understand what the test is doing.