Biggest step up in quality from one system to its successor

[Wman1996]

I honestly can't pick one. This thread is about quality in general, not quality of specs or other things.
I think the Wii U is at least slightly underrated and the Switch is slightly overrated. Despite the Switch being undeniably better overall than Wii U, I don't think it's that big of a step up overall. It inherits some of the Wii U's problems and even creates some more.
Wii may have had better software than Wii U, but the Wii U is a much better device otherwise. Look at the RAM, for instance. I know RAM is just one indicator of performance. But Wii is an abysmal 88 MB. Wii U is 2 GB. Yes, that would quickly be outdone by the Xbox One and PS4. But I think that was too be expected. Wii has an awful 512 MB of internal storage. Wii U has 32 GB (8 GB in the basic). 32 GB is bad, but it's superior by 2012 standards than 512 MB was in 2006. So I know Wii is probably a better console overall, due to a lot of the great software. But in most other ways, Wii U was a step up.
A lot of people are saying Saturn to Dreamcast. I never played either of those consoles unfortunately.