Maybe logic isn't playing into this as much as you'd like it to. I'd take Booker if it was me. I think he's exciting and loyal and would make a great VP to her Presidency. I've heard him speak and he's very inspirational, IMO.
I do like Booker, but personally I would prefer Perez. Aside from liking him, he would be a nod to Hispanic voters. Even if it's not necessary for encouraging turnout in a Trump election, it would be a welcome gesture to the growing Hispanic community that Democrats are committed to them. Hispanic voters are a fast-growing Democratic constituency and will be critical to our future coalition.
But here is the thing - Hillary is a very smart, cautious woman, so it makes me wonder. Does she have people around her telling her that Kaine's seat is safe? Surely she is aware of the potential pitfalls here, unless people are acting supremely confident when they shouldn't be.
I don't know, this worries me. I just have a really bad feeling about 2017 if she picks Kaine. It is just too unnecessarily risky.