I got the lined bi-focals. After some research, I decided there was more useable lens area. I was told the useable area of the progressive section was narrower than the traditional reading addition. -that you had to move your head back and forth when reading. Of course, then I'm stuck with one focal length, so I still have doubts I made the right decision. If I had unlimited funds, I could try them all! Then again, if I had unlimited funds, I could try all the catamarans and store them in my own warehouse.