The WiiU saw better support during it's run than the Saturn did. I know people like to say it had no third party games but on launch it had more third party support than the N64 and GC. EA, WB, Ubisoft, Capcom, and more. Saturn didn't even get that. I know people here blame the hardware for the WiiU's failure but in truth it was all marketing. From name to advertisement, Nintendo wouldn't give up on a crowd that gave up on them long ago. And worse, confused them by not showing that it wasn't just a Wii add-on or even just the Wii itself. The Wii was over and Nintendo refused to move on.
The Saturn was more of a showing of Sega's incompetence as a company. While the WiiU's hardware played little in it's failing as they at least made the attempt of making it more powerful than the PS3/360, Sega thought it would be a good idea to stick with 2D hardware when even the SNES was attempting at moving onto 3D hardware. Sega's original idea was basically the 32x as a stand alone console, then they saw that the Playstation and Nintendo (Ultra) 64 were 3D consoles, they freaked, and their solution was to haphazardly slap a 3D processor on it without much testing (testing is something Sega wasn't known for doing) causing programming difficulties for third parties. Rather than taking their time and pushing the Saturn back, they went full in on releasing it the same year as the PS1, and then charging $100 more for the Saturn. To top it off, Saturn didn't really get ANY killer Sega IPs on it. Not even Sonic the Hedgehog. The one game in development, Sonic Extreme, got canceled for some pretty fucked up reasons, one main one being that Yuji Naka was acting like a fucking baby when they (Sega Institute of America, creators of Sonic 2) asked to use the Nights into Dreams engine (the man actually threatened to quit if they used the engine). The WiiU saw Mario Kart, Paper Mario, Super Mario 3D Land, Breath of the Wild, Xenoblade X, and a lot more support from Nintendo.
The WiiU, while not a rousing success by any means, at least saw Nintendo trying, but failing, at pleasing two audiences. It wasn't until they let go of the grandma's and soccer moms that they saw success again. The Saturn was just more evidence that the Genesis was a successful fluke for Sega and that they were never really good at the console market. Seriously, look at their history in consoles from the business side.