I tried the no-line and hated HATED HATED it. Couldn't see close, mid or far. When one eye was sort of in focus, the other was a total blur. The kind sales clerks tried to get them "fit right" and none of the 3 could do it.
Went line lenses and they are far superior. I can place the line at the top of the front post so the post is clear and the target is also pretty clear. For me, the line option is working out better. It's also a bonus that they cost a lot less.