Snark aside, I wasn't aware of either of these before today, and I'm delighted that I now have hours and hours exploring them ahead of me. So thank you for the link to Google's project.
Oddly, despite the greater range of HQ works with Google, I'm finding their system significantly more frustrating to browse. One of my favourite things about art galleries is accidental discoveries - walking in for one thing, and wandering around for a while before accidentally finding something else amazing, that I'd never have thought to look for.
As one would expect from Google, their system is proving very helpful if I want to find a particular artist or a particular style - it's great for finding things when I know what I want. If I want to see just impressionists, great. If I want to see just Monet, great.
However, I'm actually finding I prefer just browsing through page after page of the Met's collection, precisely because it's not categorised and sorted to the nth degree.
Interestingly, I think it's representative of a broader problem that's creeping into society. Chance is an important element of discovery, and one that for some bizarre reason (or I suppose, for predictability of advertising), the Googles, Facebooks, etc of the world seem to be trying to eliminate. The focus on giving people what you (or an algorithm) think they want is what leads to things like echo chambers, through reduced exposure to different points of view.