millertime4060

I am looking to buy a used 150.. i have been looking and found 2 that i am thinking of buying. one is a 2007 150 speedster with a 215 motor and the other is a 2006 sportster with a 215.. they both look alike other then one is yellow and one is red... can anyone tell me what is differant between the speester and the sportser ? they are both 150's i think... Thanks