Rechargable batteries are bsically rechargable bateries. The technology is the same. Only the quality can vary slightly. Avoid the very cheapest and the very expensive/ Alsso look at the charge rating. The higher that is the longer your battery will last with out a recharge.. Given AA batteries are cheap it is alway worth having charged up spares with you.
Enthusiast always get carried away. You get the HDMI brigade that swear that 22 carror gold plated HDMI comnnector are better and the same thing for speaker wires. THe reality is that they are going to make no noticable difference other to the bank balances of the sellers and manufacturers