PC monitors of all kinds.
I have no experience with the P2411H but in general terms you can't expect picture quality from a TN panel to equal that of an IPS panel. The LED backlight has no practical effect on picture quality.

In my opinion it's no brainer. Go for the U2311H.
I have a question why so much buzz about Dell u2311h (eIPS) color reproductions is worst than other IPS monitors cause it uses 6bit+FRC which this makes it not a real 8-bit panel...
i;ve seen some comparisions with other monitors not S-IPS but with an VA monitors and the colors aren;t the best ones...