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The Dell doesn't have Thunderbolt and thus it cannot act as a Thunderbolt KVM switch like the LG. It can however act as a USB 3.0-based KVM switch, and the two USB 3.0 upstream ports can be mapped to any two display input ports using the OSD menu. Conversely, the LG can be a Thunderbolt KVM switch, but it cannot be a USB 3.0-based KVM switch because it has only one USB 3.0 upstream port.
Although there are three downstream USB 3.0 ports on the Dell (one more than the LG), two of those three are NOT suitable for wireless USB devices...this drove me crazy with troubleshooting until I saw that the manual actually states this. I've never seen nor heard of a USB port not being compatible with wireless devices, but there ya go, it's official. If you don't believe me, see page 11 of the Dell's user manual.
The Dell's stereo audio out port is not compatible with headphones. One of the Dell's HDMI ports is MHL compatible--not sure about the LG. For daisy chaining, the Dell has one DP out. Not sure how the LG would work, but Thunderbolt is supposed to natively support daisychaining.
Bezels look almost exactly the same. Stands on both seem to be pretty good, adjustable, and VESA compatible.
My Dell has really terrible backlight bleed in the corners. And not just when looking at a black screen, but during any dark content. I assume the curved LG will have the same problem; the flat versions of the LG panel (UC94/UC95) have this problem. I will be interested to see what people report on this.
I believe the LG has a hardware LUT, which is a big bonus for those who like to calibrate their displays. This plus Thunderbolt probably account for the higher price of the LG. The Dell comes with factory calibration.
Warranties seem to be the same for both--3 years.
As you state there are often one or more coupons for the Dell, but that's hit or miss.
If you purchase directly from Dell, you get the pixel-perfect policy which means they will replace your screen if there is even one stuck (lit) pixel. I am unable to find LG's policy.