The North Rim is alot less crowded and much cooler.
Its also more rustic. There are alot more people and development on the South Rim.
Its a bit cheaper on the North Rim. You need to drive there from Las Vegas (Its about 200 Miles from Las Vegas, which has several Minyanim and Kosher Restaurants)
I dont know about daily mintanum , but in general if you want to visit the national Parks forget about Minyanim. Ive been to all the major national parks and there usually are very few jews there (Ive seen some, but not enough for a Minyam)