It's Now a Obito vs Minato thread? lol
If you're comparing them then Minato wins lol
Obito was more like 15 since he's a little older than Kakashi but OT, Obito who was trained by Madara, comes from 1 of the 3 most OP clans (Senju/Uchiha/Uzumaki), have the sharingan which can read and predict movements, copy all none bloodline jutsus (so can copy fire, water, earth, lightning, wind jutsus), was given Hashirama's DNA which gave him Sage like power (Uchiha/Senju), had knowledge on Minato's abilities and time to plan for that 1 night lost to Minato who had no knowledge and who quickly analzyed Obito's Kamui power.
And that one guy was right about a smart and powerful ninja being able to be a stronger opponent. Yes Shikamaru did use his smarts to beat Hidan but his and Minato's smarts re different. Shikamaru's is more of using others power for support where Minato can analyze his opponent's jutsu in seconds and break it down to it's strength and weaknesses (he did to Obito Kamui, Kakashi's chidori, was said to create the rasengan like this)