My favorite lap hoop is not made anymore. It swivels on a wood ball. The closest thing to it is the Grace swivel hoop:
http://www.sewingmachinesplus.com/gr...od-laphoop.php . This type of hoop frees up both of your hands for quilting and is easily adjustable in terms of changing the angle for your quilting.
There is another laphoop that does not swivel; it has three upright supports that stay in place. That is harder to use.
I have used a plain quilting hoop, but it is kind of hard to juggle while quilting; always seemed to me that I needed a third hand! Also used a PVC floor frame. Unfortunately, that one was too hard on my back. Also tried quilting without any hoop at all, but found that my stitches were much less even.