You’re welcome!
There are pros and cons that you should consider when thinking about Atelier study. You are most likely to receive the best traditional training through an atelier, no doubt. However, if you ever wanted to work overseas, and to work in general in the US, quite often at least an undergraduate degree is required. It all depends - there is certainly debate over whether or not a degree is necessary to be able to be successful / work / make a living etc. It ultimately boils down to the individual and to what your individual goals are.
A university experience as a WHOLE experience cannot be matched by a small atelier environment. Having said that, finding solid traditional art programs at the University level can be very difficult, all depending on the universities that you are considering - are you looking at any schools outside of your immediate area?
Having gone to a liberal arts school for a year and a half and having then transferred to a small private art school myself, I would have to say from my personal, anecdotal experience that there are tradeoffs and pros and cons to each type of educational environment.
It would be much harder, I would think, to get a university experience (in terms of social life, exposure to a broad variety of subjects, people, etc.) at any other time than right out of high school - in other words, I think that the best progression might be from university to atelier, instead of from atelier to university. However there are financial issues of course to consider depending on the individual, and if your heart is set on being a classically trained artist, then you are fortunate to live near one of the founding ateliers in this country.
Ultimately it’s a personal choice and I wish you the best with making it. I don’t think that you can lose with whatever choice you make. I would not rule out the possibility of attending both a university and an atelier. I hope you think carefully about what you want to do. 
Perhaps a good option might be to attend a university for a year, and in the meantime develop your traditional drawing skills by taking classes at the atelier. Then you would be better informed as to which educational environment you might prefer.