@morinb, I hate to disagree with @Simon, but having purchased, used and compared the Dell and both the last and current LG 68 and 69 series (avoid the 58, even though substantially cheaper), I find the LG to be superior in most respects; especially when it came time to warranty the Dell, which was an absolute nightmare. Simon, I truly am glad you enjoy the Dell, and it seems you got one of the good ones.
Sure, if you get lucky and get a good screen that never has a problem, the screen itself is nearly as good as the LGs (can’t say for a fact, but AFAIK, Dell is using the same LG screen with their own hardware); but the review sites are absolutely littered with horror stories like mine trying to get a replacement that works; and the downtime and shipping costs they lay on you is intolerable. It’s the last Dell product I will ever intentionally own.
As for the LGs, the 27UD68P (and -W =white) is the most-superior model, and has recently become available for as low as $375-$400 on flash sales (normally $460-$525); the other 68 models, as well as the 69, are, for all intents and purposes, physically identical; from my research, the 68 is simply the cream of the crop of screen panels when manufactured and tested; and its hardware is capable of driving it to the brightest possible (it has better specifications than the Dell). Now, that said, I personally find that brightness to be insanely bright; indeed, the “lesser” 68s are also too bright at their default settings, and I have them set to about 70% of max.
If you are trying to do color accurate work in an exceptionally bright workspace, you might want the 68P; if you just want an exceptionally crisp screen with a brightness those of us with older eyes can appreciate for longer lengths of time, save money and grab the newer 69P. Best Buy usually has it around $400-$425 every day; I’ve seen it also as low as $360 for a flash sale. All cables included, except the mDP to DP adapter (I recommend you get the cable, not adapter).
I wrote a lengthier review addressing the good and the bad (there are several annoyances with the 68 and 69 both) on Amazon for the 68 if you’re interested. And, the enclosure is very nice, even in plastic, compared to the Dell; the included stands vary in quality depending on model number; but I use VESA mounts, so this is not an issue for me.
FWIW, the current LG USB-C 88 series 4K screens are also otherwise identical; they simply charge a $120-$170 premium for the USB-C (TB3) connection and hub (4x USB 3.0 ports) on the back; so, even if you own a TB3 Mac, this screen offers little more than a pricey hub you might not need, and a better performing external hub/dock with more ports/types and a DP adapter included will serve you better for comparable pricing (for what it delivers).