Overall you can't really say one is better than the other, only more suitable for your needs.
The U2410 is H-IPS and has better color accuracy, though requires more calibration to get there; it also has more features and inputs but is more expensive.
The ZR24w is e-IPS and has lower input lag, fewer inputs, is less expensive, but only has a standard color gamut; HOWEVER it is better-calibrated out of the box than the U2410 and excels at the standard color gamut.