Can i use a off brand usb controller for my runs

As long as its not a turbo controller or a controller that give any virtual advantage (make inputs faster or easier etc) then it should be fine!

You can use any controller that you'd like (unless otherwise specified in specific categories). If it does have capabilities that you won't find on a standard NES controller (such as turbo), you can still use the controller, just not the additional capabilities.

Ok thx