For anything I use regularly, I ruthlessly insist on AAs. Since the latest NiMH rechargables are excellent and cost-effective, I rarely use single-use alkalines. I do keep a couple of cases of generic alkalines to fill in any gaps.
The exceptions are internal rechargeables like cell phones and the cheap AAA headlamps I tuck in every car and kit.
P.S. The generic alkaline 9V's I have opened contained six sub-AAAAs in series. Potentially very useful.