Towns = MVP caliber prospect
Wiggins = Paul George level prospect
No disrespect meant to Paul George (I'd take him on the Celtics any day), but Wiggins at 20 is performing like George at 22. If he only improves a little, maybe he'll peak at Paul George, but again, he's 20, and has ton of growth ahead of him, both in terms of skill as well as just physically.
Wiggins at 20 is performing like George at 22 on
offense. That year, George was 2nd team all-defense behind peak Lebron.
Wiggins is also a strong defender with a huge upside, but he isn't consistently playing defense at the level Paul George did at 22.
There is no doubt that Wiggins was further ahead at a younger age, and that's why he was a #1 draft choice, but in the NBA, there are quite a few nice players scoring 16-17 pts a game. Each step above that is hard, and quite a few talented guys don't continue to evolve past that. My guess is that Paul George will score about 25 pts per game and be an all-NBA defender this year. Wiggins could become that good, or even be better, but that is several levels of improvement from where he is now. Most guys never make that kind of leap.