there is very little difference between the better chargers. some people like gadgets with all kinds of features that serve no real purpose. MAHA has made a bunch of money selling such chargers.

chargers that can charge individual batteries and automatically shut off when the charging is done are probably the best options. most chargers these days have some kind of auto shutoff. don't get the kind that have a timer shutoff as they will destroy your batteries over time.

mine does not charge individual batteries - it does two at a time. For me it is not that big of a deal as all of the devices I use them in use either 2 or 4 of them so it does not matter all that much.