Haha, goood idea.. But my main goal is really to pick the best option (rather than experience the two out of curiosity)..
I have flown Iberia 2 years ago on MAD-MVD and was very happy overall... I guess I wwanted to maake sur than LAN has good longhaul service (you never know from one airline to another.. I have flown Business on AeroMExico and was very disappointed)