A:Answer Looking up the difference between the two, the M5 helps the system multitask better and process data faster. If your're not a heavy user with many aps and tabs running all at the same time, order the M3. You also mentioned it will be for work. Depending on what your work is, opting for the M5 may be worth the extra coin now. If you plan on attaching it to a monitor and keyboard/mouse combo, I'd suggest these products. The LG 34UM69G-B 34-Inch 21:9 UltraWide IPS Monitor has the newest USB-C connection and the Logitech MK850 combo mouse and keyboard are Chromebook ready. Not all mouse and keboards are.