RiP is also easier because it is closer to an airport and better to reach via public transport.
RaR is cooler, looks better, bigger, faster, harder and scooter (and got GnR last year )
on Camping: It is more relaxed than many other festivals in Germany (and Benelux, don't know about Sweden or Roskilde
You are alowed to bring Alcohol to the camping sides, as much as you want. Your also allowed to bring generators, glass bottles and make campfires.
The campingsides are 5 minutes to an hour to walk from the entrances, but for those further away there are shuttle buses. The earlier you come the closer you can camp to the stages, but those camping sides nearest to the stages are the most anarchistic ones where you will get the smallest amount of sleep.
Camping starts on wednesday at noon, but there is enough space for everyone.