Do you mean as in "I'm a fan of the solo 2"? Or more like a fan like the EQ has (forced air) haha.
Iirc, Troy from 420vapezone.com said he preferred the solo 2 over the air 2. I think due to more sessions per charge, 9+ with the Solo2 but maximum of 5-6 with the air 2.
I have the air 2, I upgraded from an og solo. I like that it's smaller and I wanted to have temperature control, because I want to vape a variety of herbs and it's good to be able to fine tune the temp.
I only occasionally take my vaping outdoors, but whenever I did, I was a bit unhappy handling my solo, and would've preferred an air.
But if you only use it at home, or near a power outlet, the solo is possibly better, in regards to heat up time, and maybe you can get better results through water with the solo 2? I've never seen a direct comparison between the two. When I first got my air 2 I felt like the og solo was delivering a big more consistent hits throughout the session, whereas the air got me a few big hits to begin with, then I got several very wispy hits, and then about the second half of the session I got hits pretty much the same as the og solo.
This made me use the air 2 dry for a while and I think that is a really nice experience. Vapor quality is on par or better than my og solo, but much easier to hold.
You could get away with the solo 2 as an outdoor vape, at least I could, because I hardly vape more than 5 bowls outdoors, but I prefer the Form factor of the solo 2.
And I guess if you go camping or vape more than 5-6 bowls in one trip/evening, you have the option of getting an extra battery to continue vaping without having to charge it first.
I think if you don't need the temp control /screen, the og air is a great budget friendly device.
I'm on my phone right now, so I can't really elaborate (he says after 10 paragraphs haha), but I'll try to give more insight when I get back home, if needed!
Cheers!