Which diet should I use for one week trial?

I’m really itching to give a much longer duration experiment, including weekend nights, in as soon as possible.  I’d like the experiment to be with one of the extreme, for lack of a better word, diets that I’ll be cycling through.  I’ve decided it will either be a week of Paleo or a week of Veganism.  I’m going to start the trial on 7/28 and I’m going to end it the morning of 8/4.  Once I select a diet I’ll lay out the rules that I’ll be following for that diet.  I’ll be asking around to see if anyone has some suggestions on which of the two I should select.  From friends and family I’ll probably get “none of the above” :).