We have a good life in A/I. I was between rheum and A/I as a resident and ultimately decided on A/I. I think both are great fields and it really comes down to preference. If you're considering it, I highly recommend rotating through both as much as possible and, if at all possible, try and rotate with a private practice doc. From what I've heard and read, rheum probably has the better job market but this may be because there are a lot of chronic non-inflammatory pain type patients that PCPs are just waiting to offload to whoever will see them. I'll stay in my lane though and you can ask the rheumies on here about whether that's true and if that's sort of a double edged sword in terms of staying busy.
Allergy job market is tighter because we are all trying to get a steady referral base. It's not like you can just open a practice and be busy. Starting salaries aren't going to impress anyone but the ceiling is high. I would say our MGMA median, once you're a few years in, is similar to rheum. The ceiling is high because we have ancillary income streams in addition to just billing E/M codes. But it's like anything else, you will work harder than your peers if you want to earn more. Most of us work 4-5 days per week and don't do any nights/weekends/holidays and we don't step foot in hospitals. I technically have privileges at a large local hospital but I'm not on any kind of consult list and don't anticipate ever stepping foot in there for a consult. I cover call for the practice very infrequently and it's structured in a way that is very light. Like I might be on for a week and get a handful of phone calls, mostly for prescriptions that didn't make it to the pharmacy during clinic hours or occasionally for clinical questions that can be answered quickly and seen in clinic the following day. All of my cofellows (and the fellows the year above and below me) got jobs in the cities they wanted and I'm talking about nice metro areas with nice suburbs.
The best thing about A/I is that I truly love what I do. This is coming from someone who was very burnt out and cynical by the end of training...like really burnt out with a strong sense of pessimism. Getting out into practice has been night and day from training. I get to help so many people improve their quality of life and I have countless interactions that leave me feeling very grateful. Negative interactions with patients are extremely rare for me. It's really a blessing to get to do this for a living. My advice is that you try to find the light at the end of the tunnel. Find a field that you can see yourself being happy in. Don't get too caught up in numbers. Job markets and geographics matter, money matters, don't get me wrong. Perhaps I'm a bit biased because I'm married to another physician, which obviously offers me financial flexibility (...but double the student loans). I've got a pretty extensive friend group of physicians in various fields and I don't see income being the main driver of happiness amongst everyone.