I have always heard that as long as the stitches are the same, both front and back, it doesn't matter the size. I use an 8 or 9 between and can get maybe 8 stitches to an inch. I am happy with that. I rarely use a hoop or frame. I found it easier not to. I get all hunched up over a frame or hoop. Without one I can relax in the recliner and just quilt.
Anita in Northfield, MN