Who's the greatest rapper of all times?

I came across an interesting article where rap artist Eminem is considered the greatest rapper alive. In my opinion there are too many greats just to narrow the field to one.

Back in the early 1990's no one could top Wu-tang Clan for me. Cash rules everything around me got so much air play that I used to rap it in my dreams. Then came Biggie Smalls, aka The Notorious B.I.G. he hit the scenes with a young Sean Combs tapping two bottles requesting bad boys to come out and play in Craig Mack's remix of Flava in your ear. Come on how many people brought Total's single from The New Jersey Drive soundtrack to pump Biggie's rap at the beginning. I got a time and a place for my most illest rap moments like any true hip hop follower. The first time I heard a beat call out the lyricist name was Talib Kweli.

Remember when Kurtis Blow, ruled the world, when Nas was Illmatic. There are rappers who have been around for decades. LL Cool J, Salt n Pepper, Eric B.n Rakim, and Outkast. I could name names forever but the message is simple do not just pop out a list and insult the greats. Come on why was Soulja boy on the list.

Some one needs to draw the line that was cross but if anyone wants to be called the greatest lay it out for proper challengers. I am not saying that I do not have love for Emniem, Stan is a master piece like no other, it is on my top ten of all time favorite songs. However I am saying that when you pick someone there needs to be way more consideration. Because I know ten years from now who's gonna be doing the soulja boy? They stop that the summer after it came out. How many people got tried of being hot in here with Nelly, jumping with Kriss kross. Hot right now should not eligible.