Trump will have enough trouble at Beat the Cheat, without having to carry Tim Scott. We may like TS, but most of the electorate would be underimpressed. Media would be on him like an orca pod on a cornered pup.
Scott would not help with the black vote. He would be savaged by race-baiting black leaders as an uncle tom.
I don’t like TS, I think he’s a wolf in sheep’s clothing, saying what people want to hear, but his loyalties lie elsewhere.
I think that the best choice would be Rubio or Scott. Both of them are qualified, but Rubio has more charisma and is a brilliant orator and debater. Also, he is Hispanic and Trump will want to go after the Hispanic vote. There are more Hispanic voters now than black voters. On the other hand, most of them are in reliably blue or reliably red states. The black voters are more important in the swing states, and Trump wants to chisel away at the black vote. But here is the most strategic reason to choose Scott. Think about what happens if the Dems need to replace Biden, which I think is very likely. If Trump chooses Scott, then they will have no real choice but to choose a black candidate. I suppose they might try to put the black candidate in the VP spot, but that will inevitably anger some Dems. Most likely, they’d choose Harris. That would be a mistake. If they put Newsom at the top of the ticket, that would be even more problematic. They could put Whitmer at the top of the ticket and Harris in VP, but then they’d have an all female ticket. That would be problematic. My guess is they’d choose Harris for the top of the ticket and try to balance it by choosing a white male for VP. Scott creates a dilemma for them.