I use the 6 x 24 most often. I own almost every ruler made (it seems like it) and I keep using the same one most of the time. I wish I could learn how to fold my fabric and use that shape cutter or some of the others that I read a lot about. I always think that I must be doing something wrong because I just don't get all excited about that Shape Cutter! And when I fold the fabric, well, let's just say it's a train wreck!! :) So I stick with what gives me the best results and makes me most comfortable.