Should I choose airbnb over priceline

Everytime while we choose to fly we have been using priceline.com as our travel booking website for past few years. The interesting part about booking using Priceline.com is that we get to book all packages as part of single reservation
1) Choose the flights based on your need - fare, flight route, transits, timing
2) Choose hotels (or) motels - Sort by location,distance, price, rating, review, facilities offered
3) Choose rental cars - At times we get best deals rather than booking in car rental websites directly
As such we can have our complete itinerary booked within few minutes
Interestingly, I've come across an interesting website AirBnb that offers fantastic rental opportunities across globe and wanted to explore more on availing airbnb. Here are some interesting facts that I found while browsing the rentals in airbnb portal
1) This is best for group vacation - If you choose to travel as group of friends you can find a convenient vacation home
2) Rates are cheaper - As the renters charge competitive rates , I find cheaper rates
3) No Issue with pets - As these are mostly portion of homes there is no restriction if you have pets
4) Spacious rooms - In one of my recent trips they promised us king size bed but the motel couldn't honor so. However, in airbnb we see pictures of spacious rooms with correct bedding details