I have several large hoops that I enjoy using. As Don-isewman also mentioned I find the large oval is a bit awkward to work with, especially for heavier projects.
I thought it would make quilting larger areas easier, since I do not like repositioning the quilt in the hoop but found that the circles give me plenty of area to keep me busy a while and they are considerably easier to hold with one hand and are much easier to rotate for those of us who only quilt in one direction. I do not like the stands---at all.
But that is personal preference because it is how I learned. Other quilters in the family LOVE frames and can't imagine ever using a hoop. I love the portability of the hoop, it works for me. I own a frame and have never put a quilt on it.
Do what works for you and enjoy the process.