ReVanced is patched up original Youtube (which has among other things the benefits of not showing ads), but the equivalent to SmartTube would be NewPipe, which is a new YouTube replacement app.
It would not - NewPipe and its derivatives don't support Youtube accounts unlike SmartTube. With SmartTube (and Revanced, on Android mobiles) you can sign into Youtube and use your playlists, likes, comments etc.
