Both Models are available at Wal-Mart.
Should be available on amazon as well.
Both models are excellent for max settings for world of warcraft classic & retail.
17.3" model costs a little more for screen size difference + RBG lighting near the bottom.
Also has more Hz 144 upgraded to 240 , ( FPS Cap/Limit ) is the best way i can explain it.
( although with max settings, you probably want to set it to 60FPS ) for a longer lasting battery ect.