I think it depends on if its exactly the same game on the PS3 and the 360. I have the Simpsons Game for the PS2 and the 360. The 360 version has additional levels and different powers for the characters so I consider it a different game from the PS2 version.

Would you now say that you have 49 games?
You'd have 49
titles
.
There's no real answer I guess. If I had 10 copies of the same game, I'd only really have 1 game to play. But then again I could point to one and say "there's a game" and to another and say "there's a game, too."
If you wish to make an apple pie from scratch you must first invent the universe

They'd have to be exact ports of each other, down to the load times, to be counted as one copy, to which I'd treat the digit release as a backup copy.

Listen to
Iced Earth
and play
Doom

Do in that second example, a digital and physical version of the same game, would that count for two or one?
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I'd count cross console copies as separate unless they're 100% identical, physical or otherwise.

Listen to
Iced Earth
and play
Doom

The thinking in play here seems sound.