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I switch between my twisttheweb.com, qqtimer, and prisma puzzle timer. It really depends on the situation. It's usually twisttheweb then qqtimer then prisma (in order of use).
I'm a personal fan of qqtimer. I like being able to customize the layout to how I want it. There are so many options available. The only issue is that you cannot save the sessions, but I really don't care about that. There aren't many timer reviews out there so this is a good question.