I love my 60mm cutter and use it a great deal. The 45mm has its advantages in just be easier to manage. and less expensive when it comes to blades. I just purchased new blades for my 60mm and they were $6 a piece where I can get blades for pennies at Harbor Freight. Of course they don't last as long but they do the job for the cost. I also resharpen these 45mm to get more life from them. I am much more careful with the 60mm cutter and blade only because the cost is so much more to replace the blades. My preference it the 60mm much smoother.