Buy The Fox in the Forest for travel: it is cards only with a compact shared area, published 2 players at 30 minutes. Buy Jaipur if you want the easier teach and do not mind carrying goods tokens; it is also 2 players at 30 minutes.
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Both are two-player-only card games at 30 minutes, both are excellent, and both get recommended for travel. Only one of them is genuinely a tray-table game.
02Footprint on a moving surface
The Fox in the Forest is trick-taking, which means the shared area is one trick at a time -- two cards. That is close to the smallest possible playing area for a real game, and it is why it survives a tray table.
Jaipur needs more: a five-card market laid out, plus goods tokens and three bonus token stacks arranged where both of you can reach. On a stable table that is nothing. On a train, a tray table, or a lap, it is a genuine problem -- tokens slide and the market gets disturbed.
03Teach time cuts the other way
Jaipur teaches in about five minutes to anyone. The Fox in the Forest assumes you already understand trick-taking -- following suit, trumps -- and layers greedy scoring on top of that. For someone who has never played a trick-taker, that is not a five-minute explanation, and doing it on a plane is worse.
So the honest answer depends on who is traveling with you. Experienced card players: Fox, every time. Teaching someone new on the trip: Jaipur, and accept the fiddlier setup.