Wilander had an 11-9 head to head record against Edberg. Usually, the better player is the one that wins more matches directly against the other, especially when that person also has more Grand Slam singles titles as well. So there is a legitimate discussion to be had. Both guys were #1 and are Hall of Famers on most people's list of the top 20 all time greats.
Look, I get it. Edberg had a prettier, more exciting game to watch. His Wimbledon matches against Becker are legendary, as is the US Open he won in 1992 with those 5 set wins over Lendl and Chang in the quarters and semifinals, followed by the 4 set win over Sampras in the final. Those are the things that made him more memorable than the things Wilander accomplished.
I was a huge fan of both players when I was a teenager. I had posters of both of them on my walls. I emulated aspects of both their games into mine. For some reason, Wilander just happened to be my favorite.
Saying that Edberg was clearly better or that people are stupid to lean towards Wilander...