The most advanced at what? On Earth, we -think- we're the most intelligent species, but we're not the fastest species (birds of prey, cheetahs), the strongest (elephants), the most agile (don't know how you'd pick a winner here), the most numerous (there's far more biomass of ants and especially of bacteria), the longest-lived species (bristlecone pine), or the best at many other things.
I'm not going to speculate as to whether there is other life out there away from Earth, but we don't need to leave Earth to find species that are more 'something' than us. We're not the pinnacle of evolution; there was nothing inevitable about man. We just are.