I have a Babylock Tiara, which is intended to be a sit down machine but I use standing. The table goes high enough that I can ergonomically stand, and standing lets me move around to address a piece from different directions and with better framing. I have bungee cords + clamps suspended from the ceiling which I use to hold the weight of the quilt, so I'm able to move large quilts around with ease.
I live in a smaller place and was never going to be able dedicate the room to a large quilting frame, but this set up gives me much more throat and table space than trying to FMQ on a domestic machine.
I chose this machine after doing a lot of reading and then going to a quilt show where I tried several different models. I love this setup and my FMQ has advanced a lot now that I can practice at home.