It was the NDS (and 3DS), Now It’s the switch (hopefully a successor is on the way…)
I like all consoles in general and have had most modern ones up til Xbox One S and PS4.
Only own a PC and Switch now.
I like the portable form factor, I don’t feel the need for a Deck as I can play everything I want on my current devices.
For adblocking, You can get Content blockers from the app store that you enable in the settings, Personally I use Adguard Pro. I’ve also got an Extension that makes websites Dark mode called ‘Noir’, You can adjust settings global/per site if they dont look good.
Extensions/Content blockers are limited to Safari (to my knowledge).