The company I work for (LH Heavy twins) actually likes ex-TP pilots as generally you get a more rounded pilot than someone who has spent all their time on A320s/737s since cadet training.
I think the TP 'snobbery' is a legacy thing, when jets were a real handful and would bite quickly. Modern jets have fewer vices than their TP counterparts.
That said, an offer of an A320 rating is golden. Not many fly the ATR.....
The ATR is probably more rewarding to fly but you've done that. Go start building a career and get the 'Bus on your licence.