I would have to say other, because each situation and girl is different. Sure, if the date is set up by me, and we go somewhere that costs, then obviously I should pay. If it's set up by her and we go somewhere that costs, I would find out from her before I even went if she expected me to pay. If so, I most likely wouldn't go, depending on exactly what it is that she set up. But, I would first expect her to, if she set it all up. Now, if we just go somewhere to hang out or have fun, then we'd probably split the cost. Each paying for what we do ourselves. Unless she made it worth my while to pay a little extra . . .
So, as I said, each girl and situation is a bit different.