Assuming Biden doesn't run which one of these tickets would be the strongest for the Dems?

[Canis]

 My assessment is Cooper would really help in NC which is a pivotal state but he lacks charisma. Buttigieg is a charismatic but currently lacks experience a cabinet position could help but regionally he can't bring IN in to play it's just too far gone but his strong performance in the 2020 Iowa Caucuses shows he does have appeal in the region. Beshear is similar but he has to get reelected in 2023 to be part of the conversation and that is way easier said then done
Beshear is charismatic but Kentucky is even more red then Indiana and it's unclear if he'd have appeal in the Midwest. Castro could maybe help the bleeding Dems are having with Hispanic voters and would help put Texas in play but 2020s shown Texas needs a little longer before it's ready to flip. Yang would help with anti establishment and Asian voters but it's unclear how much appeal he has he also lacks experience like Buttigieg does.
I'd prefer Castro or Yang to be VP but I think Cooper and Buttigieg would be stronger Cooper imo on paper is the best choice.