Depends on if you're going during French school holidays or at a weekend. If so, then the parks will be busier and you'd probably appreciate the extra time to do everything, or at the very least be able to not have to go running from ride to ride and get a chance to appreciate the park fully. Whereas a weekday outside school holidays you'll probably be fine.
Also while it has been said many times on these boards, it is always worth stating again that the full Premier Access package is not necessarily the best option - you may well be better off just buying access to individual rides on an a la carte basis. The package is very expensive and comes with a lot of rides that probably don't need skip the line access except on the absolute busiest days of the year.
