Sure. I'm helicopter rated.
Takeoff by far. Before attempting to land I check to make sure I have enough to get back out.
The question has no honest or plausible answer unless the type of aircraft is stated. A taylorcraft ,65 hp, flown correctly, can easily land where it will not be able to take off. A super cub will easily take off anywhere it can land. A standard 172 might have trouble getting out, but a 180 hp conversion might not. Each aircraft has different parameters depending on horsepower, wing design, on and on.
Also depends a lot on who is flying.The question has no honest or plausible answer unless the type of aircraft is stated. A taylorcraft ,65 hp, flown correctly, can easily land where it will not be able to take off. A super cub will easily take off anywhere it can land. A standard 172 might have trouble getting out, but a 180 hp conversion might not. Each aircraft has different parameters depending on horsepower, wing design, on and on.

Depends. Do you want to use the plane again, or not?
I think you read it backwards.
When I had my 172 takeoff distance was definitely the governing length.
With my 182, and its "tweaked" engine, landing distance is the determinant. As the engine ages though (currently 1,100+ hours), the takeoff distance is creeping up to almost my landing distance.
Edit: I should qualify the above with "at the weights I typically fly" which is nowhere close to gross. At gross it would have been a close race when my engine was fresh. Landing probably would've been a tad shorter.
With normal braking, landing takes about twice as much (paved) runway. DA20