IMO, the best incubator for you depends. How's that for a definitive answer?
In a nutshell, I wish I could afford $400 for a bells-and-whistles incy that only hatches 20 eggs at a time. If I were renting incubators out, or if I had plenty of disposable income and were just doing it for fun, then I'd go with a Brinsea with auto-everything.
But I'm not and I don't. I've been super happy with the Hovabator forced air incubator with auto turner. It holds 40 chicken eggs at a time, which is more than enough for my backyard farm (20 would not be enough), and with the auto turner still comes in under $200. It's been highly reliable for me until recently, and I think recently I've been having a fertility issue related to chemicals in my hose water, and that has nothing to do with the incubator. The incubator holds temp extremely well. My only real complaint is how difficult it is to clean. Styrofoam is a pain, and is the main reason I gaze longingly at the Brinseas whenever I see an ad for one.
I do NOT recommend the Little Giant for beginning incubators. They can be good as second bators, for lockdown while another partial batch runs in the Hova. During lockdown, stable temp is less important than during the early stages of incubation, so it doesn't matter as much that the temp fluctuates... which it WILL do in a LG.
So, to summarize:
If hatching is a pure hobby, you don't expect to need to hatch more than a few at a time, and you can afford it, go with Brinsea.
If you have a hobby farm and might some day want more than 10 or 12 eggs at a time, and/or you're on a budget, go with Hovabator.
If you are an experienced hatcher and just need a second incubator for finishing a batch while a second batch continues to run, then grab a cheap LG.