I think the Sahara select is more or less the same trip that I went on - the only difference being that my trip was exclusive to the hotel I stayed in(Royal Kenz).
The major advantage to going on the select rather than the explorer, is that there are a reduced number of people on the coach(26 maximum, IIRC), so everyone has plenty of room to stretch out.
This was certainly better for me, as I travelled alone, and I had two seats to myself
