Potato 2.

Portal 1 is a good game, Portal 2 is a masterpiece. Play both anyway.

Both !
But small preference for the two because of the coop

Portal 1 was better for its harder puzzles for a first play through. Portal 2 puzzles were easier, to play better for the console gamers and their slow moving controllers. Both stories were good but I did not have to think at all in portal 2 so that is why portal 1 is better.

portal 2 lasted a lot lot longer than portal 1, plus its got co-op and the map editor to get 200% of fun out of the game

Portal 1. I liked it better, though I did play it first so the concept was new. I also thought the story was better in general along with the humor and suspense. Portal 2 is really good, but I felt a bit disappointed with the single player. Multiplayer is OK but wasn't necessary in my mind.

I played 2 before 1 and it was quite a suprise to see some diffrences. And of course I liked 2 more.

Portal 1.
Finished it 5 times. You felt like you can literally put a portal anywhere and complete the puzzle the way you want. P2 was 'where can I actually put the portal'. Grey walls everywhere. Also, I felt that the gel, the bridge and other stuff like that took away from an actual PORTAL experience. And I didn't like the story. It was too predictable, too long and didn't grab me. Portal 1 length was just perfect to leave the player with this 'holy crap' feeling without dragging the game or making it too short.

Portal 3

...ooops Valve can't count to 3.

The original.

Portal 2

portal 1 the best

Portal 2 of course

I beat Portal 1 in about 2 hours, it's not very long and there's not a tonne of story compared to the second one. The second one I beat in about 6-7 hours, so it's much longer, the story is very rich, and it has multiplayer on top of that. I'd say Portal 2 over Portal 1, but if you want to get the entire story of portal pick up both, Portal 1 tends to be cheap these days anyway

Portal 2
WAAAAY longer story, harder missions, online and workshop

Portal 1

It's like choosing your favourite child.

Portal 2

Portal 1's puzzles are more developed and difficult. Portal 2 was very straight forward and never really requires you to stop and think.

Most of all, Portal 1's story was immeasurably better than Portal 2's (GLaDOS as a potato AND your friend... really?)

But Co-Op is nice, so Portal 2 gets a point for that.

both.

Portal 2 for the story.

I actually have the feeling portal 1 goes further on the good perks they made and vary on it, while portal 2 always have to introduce new stuff every x-numbered testchambers to keep the game intresting

portal 2

why can't we have both?

Portal 2 is much better, then Portal. It has a lot new stuff, like new kinds of gels, new settling and a wonderful story. :D