Well it depends on numbers for sure. But camels are cheaper, easier to mass and upgrade (heavy camel upg is cheap and researched faster in WK). They are also way faster so you can choose the fights with hit and run strategy. When you consider the size of unit it is also easier for a group of camels to surround elephants and overwhelm them. But I agree WEs are strong and dangerous when they have the numbers. From my experience they have been one of very few counters in aoc to elite mangudais. The most dangerous situation when they shine the most will be in combinations with CAs/ xbow or other range units. Then they can truly benefit from trample damage in big fights vs kts. I am not convinced though that 4 of them would beat 10 camels. Maybe.in direct combat but with proper micro I don't think so.