Many here believe the two best charger manufacturers are Pila, and then Xtar.
Best batteries are Panasonic, AW, and Efest. Some companies recommend a certain brand of battery because the battery tubes and contacts were designed especially for that brand. For instance, Provape recommends only AW brand IMR batteries for the Provari, the use of any other brand will void the warranty. They specifically state not to use Trustfire and Ultrafire brand.
Before investing in batteries for your mod, find out exactly what type is recommended. Some mods require flat top batteries, others require nipple or button top batteries. The vriable voltage mods generally require high drain or IMR batteries and not the protected batteries.