There is not a PG in this draft that is better than Rubio is right now and it'll probably take 3 years for one of them to be better. Ricky is in the 10-15 range of starting PG's right now and I don't see anyone from this draft being in the top half of starters as a rookie. There's no Ja Morant in this class. LaMelo is the top PG and he's actually a worse shooter and is much more of a ball stopper than Rubio has ever been. I can't see him co-existing with Booker for long either so he's not the better player you're looking for. There are some intriguing PG's like Halliburton and Hayes but they're not ready to start on a team like the Suns, who are in win now mode.
Wiseman has a higher ceiling but we don't need a Center and would be better trading the pick or taking him and trading him or Ayton around the All-Star break. Taking him to trade later isn't a great move for a team that should be fighting for the playoffs all year so trading the pick is a better plan. The value of that pick won't be very high though. It's unlikely anyone would part with an All-Star unless they had a really bad contract, like Kevin Love, John Wall, Blake Griffin sort of bad.
I wouldn't trade Oubre for the #1 pick and I doubt I'm alone in that regard. There isn't a wing who is better than Oubre, definitely not as a rookie or sophomore. If the team who gets the #1 pick decides to trade it then the best they can hope for is a player like Oubre, a guy who is a good scorer, decent defender, and one of the best high energy tone setters in the league. The top wing, Edwards, is similar to Barrett and I'll bet his numbers this year will be quite similar to RJ's as well, 14.3 ppg, 5.0 rpg, and 2.6 apg while shooting 40.2% from the field and 32% from 3. RJ's college stats were better than Edwards and he was competing with Reddish and Zion for touches.
I agree with Ouchie that you are failing to recognize how poor the top of this draft is. Even if the Suns get #1 overall, they won't be able to draft anyone there who will take either Rubio or Oubre's starting roles. I can't see a team in the lottery that desperate to add Wiseman, Edwards, or Ball that they're willing to part with a player who can contribute now and for the next 2-3 seasons. Those 3 are the top 3 prospects and I don't think any of them are locks to be All-Stars anytime soon. Oubre's odds off being an All-Star in the next 3 years are probably the same as theirs.