Basil, to me has a slightly sweet and slightly peppery smell. It also looks more like flat little bits of leaf while oregano looks more like little stick bits of leaf (has a rougher, pokier texture) and the oregano has a bit of bluish tinge while the oregano is slightly yellower in it's green-ness. If all else fails, look closely the next time you shop and compare what you have.
Okay, I think that I may have figured it out. They both look pretty similar to me, but one does look a little pokier than the other and the pokier one is also the less sweet, more pizza-like smelling one, so I am going to guess that that one is the oregano and the other is basil. Thanks for the help and let's hope that i got it right.