We've looked at the Dell Latitude 7400 next to the trusty previous-gen 7490.

Brief summary:

Pro of 7400:

• Sleek, thinner and lighter design, metal option

• Privacy webcam shutter; embedded fingerprint reader into the power button

• More display options (e.g. privacy / low power display)

• Processor with a higher single-core performance

Pro of 7490

• Better port selection: has 1x extra USB 3 port, Ethernet port & sims tray

• The rubberised casing feels warmer in the winter

• Dual trackpad input

• More accessible cost (has been out for longer)