I agree, the current Invidious UI is great. Its snappy & is very lightweight.
Yes Materialious is a SPA, if you aren't comfortable with JS. Simply stick with Invidious's interface.
Materialious does provide some features what Invidious doesn't provide, like PWA support, RYD, Sponsorblock, Video resuming, inline chapters & additional theming. But Materialious isn't a replacement for Invidious's interface, just a alternative.
Yes Materialious is a SPA, if you aren't comfortable with JS. Simply stick with Invidious's interface.
Materialious does provide some features what Invidious doesn't provide, like PWA support, RYD, Sponsorblock, Video resuming, inline chapters & additional theming. But Materialious isn't a replacement for Invidious's interface, just a alternative.