I'd rather it be Harris/Klobuchar or Harris/Booker or even Harris/Biden or Harris/Warren or Harris/Hickenlooper.
Biden is never going to go for vice presidency again. He did that, and got the t-shirt.
And everybody on your list except for Hickenlooper is a lawyer, as is Kamala. I think lawyers are grossly over-represented among Democratic politicians. Dems should give other professions a chance to lead too.
I think Pete is too young and so is Beto.
β will be 48 by the time of the election. That is not too young for the presidency (there have been six presidents younger than him, including last two Democratic presidents), much less the vice presidency.
But he lacks experience - Clinton was a two-term governor when he ran for president, for fuck's sake! Nevertheless, vice presidency might be a good fit for him.
Mayor Pete is quite young - still under 40 come inauguration day. He would be the youngest president if he is elected. But he would be only the 2nd youngest Veep.
And while his experience is as a mayor of a mid-sized city, that is an executive office and he also has experience in the Navy as an intelligence officer. Between him and β, i would certainly prefer him for that reason, but I think both will be on the short list for running mates for many of the other candidates if they win the nomination.