By DrayanoPokémon Blaze Black and Pokémon Volt White are edits of the regular Pokémon Black and White versions which self-contain all 649 Pokémon, allowing a player a large amount of variety. In addition, BB/VW also have edited trainers, an increased difficulty level, improvements to many Pokémon and more. They are the spiritual successor of my two other hacks, Pokémon Fire Red Omega and Pokémon Spirit Gold. Blaze Black and Volt White were also - with one minor exception - the first of their kind to be made.
I should mention that with the exception of things normally different between Black and White such as Black City, White Forest, the legendary focus and the appearance of Opelucid City, the two games are identical.
Pokémon Blaze Black 2 & Pokémon Volt White 2 are essentially the sequels to my Black & White hacks known as Blaze Black and Volt White. The usual rules with my hacks apply; the main feature is that all 649 Pokémon are available for capture somewhere in the game, and the trainers have all had their rosters changed in order to maintain a much harder challenge than the original game, as well as having an increased variety of opponents to fight. There's also a large amount of alternative features these hacks offer, which range from differences to the Pokémon themselves to the presence of a couple new TMs. If I'm not mistaken, these are also the first Black 2 and White 2 hacks on offer.
Additionally, the two versions only differ in terms of their aesthetic differences, such as the appearance of Opelucid City, the title screen, etcetera. So basically, just pick whichever colour takes your fancy!