Currently own a Dell 2405FPW: 24 inch, 16:10, 1920 x 1200. Want a new 24/25 Dell monitor for software development. Thinking of dual monitors. I've found two other 16:10 monitors: P2421 and U2415 I can see lots of glowing reviews for the U2415 but not much on the P2421. Would P2421 be better as it's 6 years newer/anyone know about it?