I wouldn't say I favour the EW2420, broadly speaking. I find the XL2370 a lot easier to recommend due to the obvious inconsistencies between EW2420 units and the slightly off-putting responsiveness. I was absolutely amazed by how well colour-balanced our EW2420 was out of the box. We ran through calibration with a Pantone Huey a few weeks ago and the changes it made were so minor that it made no visible difference. The XL2370 really does look great (at least I think so), has responsiveness above and beyond most other 60Hz monitors and has very good colour vibrancy and brightness.
The price of the EW2420 seems to have crept up from the £160 and very well-tuned unit we were testing and gave 83% to overall, whereas the XL2370's price has been reduced significantly from the £260 unit we gave 81% to. I'm glad the review was of help - we were recommending it that strongly when it was £260+ to buy. Now it is far less it's a stonking monitor choice, as you say.