I have both a 24" semi square Grace and a 30" round Hintenberg. I have done probably 100 quilts of various sizes between the two of them. I have one upstairs and on down. Both of them have a balljoint in the middle that allows me to turn the quilt around without having to rehoop until all of the area is done. The Grace frame is more square than round. It also has a lamp attached. The craftmanship on it is better than the other. For small projects I use a PCP frame that I can break down and put in a tote to take with me to Bee or on trips etc.
Maybe because I have been quilting for at least 40 years I have learned the hard way to not try and work on a bigger round frame as I tend to hurt myself reaching to far. I also work very fast so when using a conventional long floor frame I have to use a chair on wheels so I can move easily. If price is a factor they are about compatible.