Both Bushnell and Simmons are good, simmons pro hunter is made with lesser parts than other scopes made from aircraft grade aluminum. people go for bushnell straight because they are known for making best hunting scopes.. here's comparison of both from same site.
http://www.riflescopeguy.com/simmons...-scope-review/
http://www.riflescopeguy.com/bushnel...escope-review/