Nook HD has
no- web cam,GPS with google maps ,no USB host so you can connect USB devices. NO google play store 500,000 ++ Apps (2nd largest in the world) NO SIDE loading of Apps
NO access to other App or book stores.
With the Nexus 7 you have all that + you can expand the memory using a very cheap App $2.99 & a OTG cable so you can connect USB memory sticks,cards or hard drives for unlimited storage to your nexus 7.
NO ROOTING NEEDED
https://play.google.com/store/apps/d...importer&hl=en
Google play store has lots of apps that are FREE that other App stores like Amazon and B&N charge for.So if you have a device to access the google play store you can save yourself more money.
Amazon $2.99 Bad Piggies HD version
http://www.amazon.com/gp/product/B00...d_i=1000663181
Google play $0.00 Bad Piggies HD version
https://play.google.com/store/apps/d...aWdnaWVzSEQiXQ..
B&N $2.99
http://www.barnesandnoble.com/w/bad-...=2940043924636