I bought both (pre-ordered, even!) but, to be totally honest, I never really saw them as huge improvements. Not big enough to recommend them over the base systems.
I don't think they expanded the market or anything, either. It was the "fear of missing out" combined with buzz words like 4K and FPS. Games looked better but they were still the same games and thus, not worth the upgrade.
The 3DS kinda an upgrade done right because it did offer a substantial, tangible improvement in both power and functionality (built in right analog nub) but it also hurt the success of certain games by dividing the market.
Not sure how I feel about multiple tiers going forward.