Strongly suggest you go to a larger show where most of the large manufacturers are represented and try as many machines as you can. The sit-down long-arm market has grown leaps and bounds in the last 5 years and today most (all?) manufacturers have at least one.
A few pointers
Tables are just as important as the machines. Some tables that come with the machine are smaller than others, some offer add-on's. Most of us have found that we want more table space at least on one side. So consider the size of the table you buy plus the add-on, and weigh against adding your own table to the side. Compare costs.
Try both vertical and horizontal orientation (horizontal - oriented like a domestic sewing machine, vertical oriented with the needle at the front facing you), then consider the space you have and how it will fit. Use both the horizontal and vertical. Some folks have a preference for one or the other.
Try machines with and without a stitch regulator. The stitch regulators on the sit-downs are much different than on a long arm. I tried the SR on the HQ16 and I didn't like it. Others love it!!
The Baby Lock Tiara and the HQ Sweet 16 are the same machine with different branding. So if one is offered by a local dealer that might be the deciding factor as to which one you get.
I have the Juki 2200QVP and I love it!! Some of the things I really like: A handwheel located at the front of the machine within easy reach while sewing for precision placement of the needle (the Juki is one of the only sit down machines that offer this feature), great lighting, 18" long harp and 10" high - wide open harp is easy to fit even a King quilt, On-board bobbin winder with independent motor. Easy maintenance - only one oiling point (in the bobbin case). Solid and fast machine - I run mine at 30% of the speed. I set mine up myself (with the help of my husband), and was quilting in no time.
Leah Day has a good review of the Juki 2200QVP. Here's a link.
https://leahday.com/pages/sewing-mac...t-down-longarm