The best Future Stars cards definitely include Julián Álvarez, Mykhailo Mudryk and Jamal Musiala FIFA 23 Coins. The rest of the cards are pretty mediocre, but not really the best. Most other cards are either slightly above or below the current SBC price.
For the FUT Centurions you obviously want Neymar. Other good players would be Trent Alexander-Arnold or Wissam Ben Yedder. But here you also have some bad cards like James Milner, Florian Nehaus or Maximillian Arnold, who will immediately go back in to the next SBC.
Regarding RTTFs, you should hope for players that will participate in Champions League, Europa League and Conference League until the very end. Some of the best picks are Leon Goretzka, Anthony Martial and David Alaba.
By the way, FUT Baller being left out means that the current event cards and some of the most valuable players are missing. Maybe it will be their time in the next Campaign SBC.
All teams are linked above, so if you really want to double-check each player, click through. If not, you should at least click on this video, it's pretty good:
So now you know who you could get everything, there are some really nice cards included buy FUT 23 Coins. But the whole thing is of little use to you if you don't know how much you have to spend on the SBC. We'll explain that to you now.