Why has the 3DS so much quality titles?

[Conina]

If I had to decide between DS games and 3DS games, it would be a hard decision.

The 3DS games are much prettier of course. But DS had (so far) more of my favorite games: the CING games (Hotel Dusk, Last Window, Another Code), 999, 4 Professor Layton games, 6 Ace Attorney games and 2 new Zelda games.