I voted Mirage as this was my introduction to the band.
One day, I was a the local record store (that I visited very frequently in those days) and the store owner asked me if I knew this band, 'Camel'. Well, yeah, heard about them, a familiar name, but never heard any music by them. The store owner gave me Mirage. He said: I'm sure you'll like this. Listen to it, and when you return here next week, you bring money to pay for the cd, or you return the cd.
A week later, I returned with money for the cd. (of course) ;)
Moonmadness for me captures the essence of Camel. Stationary traveller comes in a close second. Would have been an even harder decision if live stuff was included as I regard A Live Record as one of the greatest live records ever.
I voted for Mirage. The debut album "Camel" did back then, unfortunately, not the desired result. Even more astonishing is it, have set the Camel with the second album "Mirage" is a milestone in progressive rock history.
Besides the great successful songs Freefall, Super Twister, Nimrodel and Earthrise is the anthem of all Camel fans, "Lady Fantasy" on this great LP.
I like to remember the happy hours with old friends that I spent with this music.
Unfortunately, on some later albums Camel has subordinated the musical mainstream. Much fabric softener, but what it is, they are again a bit long in the old track.