What is the reason that some itineraries going to the EBC via Pheriche and some via Dingboche. What are the pros and cons of each route? Looking at the map, it seems that at the end of the Pheriche route, there is a steeper ascend than the Dingboche route. Another reason I can imagine that there are more accomodation options/infrastructure in Pheriche?
What is the truth?