When you say brush, what does that mean?  4-8' tall plums thickets, elms or what?  

We have mulched a lot of acres with a skid steer then planted right into it.  That mulched stuff breaks down quick.  We have a chipper style (tomahawk I think?) and not a fecon head which strings things up.  I'd mulch it this year, then spray the heck out of it next fall to clean up the small regrowth and it'd probably be good to go.  Now i don't pull shank equipment so that might change the need to pulling vs mulching.  Small excavator and a thumb can clean things up nice too, pull, pile burn.