Yeah fair play. I've been struggling with the exact same decision between the two for the last few weeks. Given that they're the same panel, i'm sure both will be excellent. For some the 5 year warranty will be worth more, for others the exta 24Hz is more valuable. Don't think there's a wrong choice to be fair (although i'm sure @aoaaron will disagree and make the case for OLED )
I'm almost tempted to order the Dell as well and compare the 2 myself. That way I can keep the one I prefer and move on the other!