You should use your college profs unless you are in huge lecture class where your prof doesn't know you from the other 200 people in the class. Even in that situation, consider whether there is a way you could attract the prof's notice, such as by asking questions, seeking out the prof for extra instruction, etc. You obviously don't want to make a nuisance of yourself but you might be able to be someone other than a number. And, you don't need to ask for the rec until later in the year, so there is time to make a good impression. Of course, if you have a small section class, you definitely should get the prof's rec.