Buy it for room freedom, not for offline flights.
Who this is really for
Someone else has the TV. Your PS5 is still the machine you care about. Portal is for that exact domestic politics problem—continue the campaign in another room without rebuilding a PC streaming stack.
If Remote Play already works well on your phone or Vita nostalgia, Portal is the comfort upgrade: better controls, dedicated panel, fewer heat-on-face moments.
What it does better
Integration. DualSense features travel with you on supported streams. The UI is aimed at one job: connect to your PS5 and play. That narrowness is a feature when you are tired of tinkering.
As a second screen strategy, it keeps the living-room TV free without buying another full console.
Living with it
Wire the PS5 with Ethernet if you can. Put Portal on a clean 5 GHz or better path. Expect perfection only when the network is healthy—this is streaming physics, not a Portal defect.
Battery and brightness habits matter on long sessions; treat it like a serious handheld even though the games live in the other room.
Trade-offs we checked
Against Switch OLED, Portal loses standalone software and wins PS5 exclusives remotely. Against a ROG Ally, you lose local PC libraries and gain DualSense-native streaming simplicity. Choose Portal only if PS5 Remote Play is the job.