Interesting, I'd think the glossy screen would not work at all outside, but looks like I am wrong. Was that a sunny day or was it overcast? My 240x was ok when it's overcast, but not so much when it's sunny especially if the screen is dusty. The problem with the iPad is you have to touch it all the time, so the screen can't be all that clean. You didn't find it a problem?
I wouldn't call being in a bus "outside" unless you are on an uncovered roof of one of those two-story buses. And yes, the iPad screen works fine on buses unless the sun is shining directly behind you, in which case, just move to the other side of the bus. I don't think you can make a direct comparison with the screen of your 240x, it's just not the same technology.
And yeah, you get fingerprints and smudges, most of which you don't see while using the iPad because the screen is so bright it washes them out. Just carry a soft cloth with you to wipe it down when needed.