Funny how this question surfaces every year.
Jet is best (usually) for your longterm career prospects, if you have any interest in flying for larger airlines or larger jets or (obviously) long haul.
ATR command, if it puts you securely in the base/country you want/need to be in. Don't dismiss the damage a nomadic lifestyle can be. You could argue that the ATR command would be a good 'foot in the door' for an interview for a jet job, but you have already achieved that, so whats the point? Take the jet, work hard and hope for an early jet command, thats about as secure as this industry gets, these days. ATB