It's all subjective.
I've currently got four airbrushes (five if you count the ancient Paasche H that I use as a carpet bomber) - the Iwata HP-CS Eclipse, Iwata HP-C+, Harder & Steenbeck Evolution Silverline, and Harder & Steenbeck Infinity. Over the past two years, I've owned and sold a Grex Tritium TG.3, Badger Patriot 105, and Badger Renegade Velocity.
Of those, the HP-CS is far and away my workhorse. Along with the HP-C+ for detail work.
The things I like about the HP-CS - it's versatile, easy to break down for cleaning, and bulletproof. The needle on that thing seems to hold up a lot better. You can also swap in a .5mm needle/nozzle (I believe designed for the HP-BR) and get a wider spray pattern.
The HP-C+ is a jewel. Sucks for big, consistent coats, but I'm doing a lot less of those nowadays, and I've been doing a lot of shading and modulation work with the C+ recently, even on big paint jobs. The feel and performance of the thing is great, but it is a bit harder to clean due to the tiny nozzle and tiny paint channel.
The Harder & Steenbecks are similar to the two Iwatas. They seem to spray acrylics better, and that's where they really see use. The needles are more fragile, though, and I've found them very prone to initial spatter (when you press the trigger but don't pull it back). My Iwatas never spatter, so I tend to lurch their way for fine work where I don't want to fuss with it.
The Badgers...I didn't like the way they felt, and the non-linear needle design of the Patriot really threw me off. The double-taper, at least to me, created an "all or nothing" feel to the paint flow.
The Grex - is a FANTASTIC airbrush. But the trigger mechanism that sounds so appealing was, in practice, a recipe for carpal tunnel. After using it to mottle a North African Bf 109, my arm was basically numb for a day. I've thought many times about picking up their non-trigger equivalent. The Genesis, I think it is.