Can someone explain to me the practical difference between these desktops?

http://www.apple.com/shop/buy-mac/imac?product=MK142LL/A&step=config

id be unsung it mostly for reports and videos

http://www.staples.com/HP-Pavilion-24-b016-All-in-One-Desktop-PC-Intel-i3-Processor-8GB-RAM-Memory-1TB-Hard-Drive-/product_2257012

http://www.bestbuy.com/site/lenovo-700-22ish-21-5-touch-screen-all-in-one-intel-pentium-8gb-memory-1tb-hard-drive-black/5196200.p?skuId=5196200

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