confused on new tires and wheels

I am still running factory tires on a 2007 sportsman 700 and 2007 sportsman 500. It is time to replace them and i’m totally lost. We ride mostly rocky terrain and i looked at the Maxxis bighorns but they are gonna rub. I have been reading about spacers, offset wheels flipping tie rods. Would my best bet be the BHS in 26 or move down to the 25s? And if i bought the Delta steel wheels which offset would i need?