Analysis is more about the problem, design more about the solution, so I'd say design. In anyway, it shouldn't be a *phase*, though. They need to be done concurrently. And you shouldn't decide on a particular technology before you absolutely have to - the longer you wait, the more information you have to base your decision on. So it really doesn't matter that much wether it's analysis or design.
Why do you ask?
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus