ENB Boost is this one -> http://enbdev.com/patch_oblivion_enboost_v0259.htm
ENB Series is this one -> http://enbdev.com/mod_tesoblivion_v0181.htm
You have to chose one or the other, can't have both at the same time. AFAIK, ENB Boost don't have the graphics code in it, it's just a performance patch... but maybe the graphics mod has the performance enhancement additions (at least some of them) but in turn it'd probably cost you some FPS on a low end system, depending on what you enable.
ENB Boost doesn't have an in-game menu, just displays a splash while the game is loading and that's it.
ENB Series has an in-game tweaking menu in which you can test all kind of changes to the parameters.
Hope this helps