Another Wii U bash-and-trash topic... URGH. It's rather tiresome. Apart from first-party titles which released at a cheaper point of entry than their (not always) enhanced Switch ports, I still feel that Super Mario 3D World is the best realisation of the Marioverse. One might suggest that it has the better versions of NSMBU and NSLU, Rayman Legends, and Lego City: Undercover (loading times aside), as well as the best version of Sonic & All-Stars Racing: Transformed. Then you have unique titles such as Affordable Space Adventures and Scram Kitty And His Buddy On Rails. All 3D LOZ titles are playable on it. It also has Wii Fit U, which may not matter to some on here, but I used to do yoga and Pilates every week, among other classes, and consider it to be a positive. I could list a lot more, but some have found their way to the Switch, while others would appear to be inevitable, if not mentioned on here already. I went the Wii U/3DS route only, and still use both in 2019. While I have access to a PS4 through family, I've never felt that I missed much elsewhere, and I've never once experienced a "game drought". I know that it's blasphemous in this community to say that the Wii U does anything good at all, let alone better than the Switch, but it does, in my opinion. The Wii U was actually the first Nintendo home console that I've owned since the SNES, and I consider it to be one of the all-time greats, when used in its fullest capacity. None of that is to say it's without flaws; I don't accept that it's "bad", because that's completely irreconcilable with my actual experience of the platform, one that I'm still able to enjoy today. Beyond the games, it had more going for it than some would care to recognise, and that's before getting to the fact that many millions of Switch owners are enjoying it right now, with all of those ports.
Asymmetric gameplay
Dual Screen support
Multiple Control Options
Netflix
Internet Browser
Wii Backwards Compatibility
Virtual Console
Better Pro Controller Battery Life, although it has no HD Rumble support.
Better online services, for free, no less.
Before it closed down, it had Miiverse.
I also feel that it was BS to see a host of Switch owners DEFENDING the loss of some of these features, claiming that it enables them to access their games more swiftly. While the Switch is awesome, it can be so much better. I won't ever get into the business of bashing and trashing the Wii U, then pretending that the Switch is perfect in the same breath, when it's far from it, and when Nintendo have set some bad precedents.