I do not like basting, that is avoided with a long arm on a frame.
But you do need to have a room large enough for the LA. I am lucky to have lots of space in my home.
I also find I find it hard to move even a small quilt around on my dsm.
There are cost constraints too. I paid for a 10 year old HQ16 what I would have paid for a sit down system. A newer LA on a frame would cost more and I may decide to upgrade in a couple years.
I would not be interested in one of the LA machines on the small frames (Little Foot etc), because you still have to baste.