My bicep routine consists of 2 exercises and 2 sets of those exercises (thanks to I**mfkr) on my back day. After I finish training my back and I get into biceps and my two exercises that I have been doing are:
-Alternating dumbbell curls
-EZ-curlbar curls
I really like those two, because I can go extremely heavy and lift intensely. I've always liked the straight bar curls, but the EZ-curlbar is easier on my wrists. I've also read that straight barbell curls are better for stimulating the bicep muscle. So the bottom line is:
Straight Barbell Curls or EZ-curlbar curls?