The Portal still has advantages of having all the fancy Dualsense controller features like adaptive triggers and better rumble.

Also 1080p screen compared to the Deck's 720p. OLED is definitely gonna be nicer though.

I'm still debating whether the Dualsense stuff and 1080p will be worth the 200-300€ price

vs. just playing with my Deck (and maybe upgrading it to the OLED version)