I think we do have to mention that the pro characters are a little overpowered in a way.
I've seen people being amazing with the pros as they have 3 skills not 2 like the customs.
And they struggle with the customs.
I think that the custom characters need more skills from the player itself. Because of their 2 skills only. It's is maybe a handicap which makes the customs actually cool to play with.
A serve beserker can hit ace after ace. But in the rally he will lack a lot of things.
And as I said certain pros have about 20 points less then the other. I will play with Wawrinka. He will automatically be less good. Setup wise. I wouldn't mind the challenge but with custom this won't be the case.
I just played a match with Mack. He had a big hitter . Me more an all rounder. We had a heavy match that went 6-4 1-6 6-4 . He had the more powerful player. Yet we both had 540 so in the end both can win. My timing just had to be perfect on all the shots. Which I wasn't able to do in the second.
So a pro tour would be funny. Yes there will be match ups with legends. But they are def. not more balanced if you ask me. Why not just make your own version of pro characters...
And with the customs there are certain setups that work best. But I have yet to have seen my exact setup. And a single hander etc. Some similar setups yes. But not the exact.
And for example Hola It's Mike plays with a setup I can't play with with coachs that don't do it for me . I wish I could cause he is great with it .
One thing I do find good with the pros is that the crazy short cross rallies are harder to pull of with certain character. But with Agassi Nadal and Simon and Davydenko it is possible which makes them monsters directly
In the customs those rallies are happening as well. Maybe a little more.