Bus travel Info-Puerto Vallarta

I was told "La Estrella Blanca" is the only one doing direct in "first class"...and for a night trip,it's well worth the price difference as I came to Zihua after missing that direct bus and had to use 3 different buses and it took mke 18.5 hours and 2 of them were regular service and although not terrible,it is worth paying the difference for the time difference and the ac is nice