So much depends on YOU. What is your budget, how big a space do you have, can you perform basic maintenance on your machine or will you want to have it serviced by your dealer, and so forth.
I own an Innova, quilt only for myself (and let the occasional friend come over and use it), and do not have robotics.
Here's what I have to say about choosing brands:
Years ago, when I was a baby quilter and before I bought my Innova, I joined a group of longarm quilters. We would get together monthly, rotating locations amongst our homes, and share troubleshooting tips & tricks, learn about longarm techniques, and have show-n-tell. Ownership of longarms ranged the gamut of brands - A1, Tin Lizzie, Gammill, Voyager, Nolting, Innova, Homesteader, Handiquilter, you name it, someone had it. Gradually, everyone traded in their previous longarm for an Innova with 2 exceptions: we still have one Gammill owner and one HQ owner. Our meetings have gone from complaints and frustration with the machines, and how-do-you-solve-this-problem, to lots and lots of show-n-tell. There's a reason why so many of those companies I mentioned are now out of business.
People will tell you to "test drive" the machines at shows. I don't think this is good enough. When I was in the market, I took a class that was designed to teach me how to use the machine so I could rent time on one in the future. This was a 5-hour class and covered everything: winding bobbins, threading the machine, changing the needle, loading the frame with backing/batting/quilt, adjusting the tension, how to change the feet and which foot to use when, troubleshooting, and we even got into some basic maintenance. I was able to see how much space the different frames took up, and I got to play on the different machines (robotics vs non, 22" vs 26", etc.) I learned SO much in that class, I was much better prepared when I went to the shows and shopped the other brands. I knew what to look for and what I wanted.
I ended up buying an Innova for these reasons:
1) It's not picky about thread. (I can't tell you how many times I see people say "my machine only likes XX brand thread"). I can use any thread I want in my longarm without issue.
2) I can service it myself. The owner's manual shows me how to fix common problems, and support is a phone call away (see next paragraph).
2) Innova is the only brand that I'm aware of that has 24/7/365 telephone support - yes, even on Christmas Day. You don't have to wait for a service tech to come to your house, you don't have to ship the head somewhere for repair, and you're not down for 3-4 weeks. Having said that, I've owned mine for 5 years and it's never needed to be serviced.