You will probably want to try one out first. I thought that I wanted a LAP frame - and I did but a SIT-ON frame was the best for me. I found that with the lap frame, I had a tendency to lose it off of my lap if I moved to reach for something. The SitOn frame works much better. If I am working on something bigger, I have my floor frame that adjusts lots of ways to get it just right. I would just try a few out before you make the purchase.