Delta Premium Select vs. United Premium Plus: Which product wins the passenger experience?

Delta's premium economy product is called Delta Premium Select, while United Airlines' equivalent is known as United Premium ...
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I took 66 Delta flights last year and flew in all of its cabin categories — but I still prefer the cheaper economy seats

I flew in all of Delta Air Lines' cabin categories last year, from the economy main to Delta One. Some upgrades had drawbacks, like Delta One's dated cabin and Premium Select's limited seat choices.
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What you get when you buy an upgrade: Premium economy, business and first class explained

Don't get tricked next time you pay for an airline upgrade, because you might not be getting what you expect. Here's what I mean. I'm going to show you a few pictures and I want you to pick the one ...