There is no discrepancy. Esperanto is the most spoken logical auxiliary language and Interlingua is the most spoken natural-seeming auxiliary language. It's similar to saying, ABC is the fastest 100cc motorbike and DEF is the fastest 200cc bike in the world.  

 Both Esperanto and Interlingua just happen to belong to different categories and both of them are leaders in their own right. 

 Posted on 15 August 2010, 17:55 Un Alien