Which is better geting a spray tan or doin it yourself?

how many days in advance would you get a spray tan done? any advice?Which is better geting a spray tan or doin it yourself?
A spray tan turns out better, totally even and all over. It's more expensive though. If you are going to apply the tan yourself, I think St Tropez and Fake Bake are good for getting streak-free color. If you have a party you're going to, go for your spray tan the day before : )