I'm a modular student with a PPL at the moment so perhaps others with more experience will have different opinions. I wouldn't hold any preference over an ATC airport as a training base for two reasons:
1. You're not paying for so time in the aircraft holding for others.
2. Whilst I'm sure there will be some training benefit from flying from one, I don't it's necessary to have most of your flights parsing from there. I'm sure a handful will be plenty.
I hope that helps.