I have a Deta 40-540. I don't do a lot of scroll work but I'd guess more than many at this forum. It's be a reliable tool.
Find something you are comfortable at because you spend a long time at a scroll saw. First, compare how easy it is to change blades, then are the controls intuitive and where they should be, is there a stand or will you have to mount it to a workbench. is there a light (most scrollers need quite a bit of light because the cuts are freehand and so fine. finally how much does it vibrate. I don't know if the model you are thinking of has variable speed but that's another important feature.
Finally, like many cutting tools - it's the blades that are really important.
May the grain be ever in your favor.