For me, the answer is just "whatever has the game I'm playing on it." In cases where I have multiple options for the same game, I tend to rate features against prices. I'll usually go with the least expensive option, at least in the cases where the versions are identical. If a certain version is especially feature-rich or promising, I might get that version (for instance, I got Rock Band for the 360 rather than the Wii or PS2 version, because of downloadable content, even though the 360 version was more expensive).
Also, I love the DS, but DS ports rarely work out, in my opinion, especially ports of PC games. Phoenix Wright comes to mind, but those were up-ports rather than down-ports, and of course the originals were designed for a handheld system as well, so that helps. Pacing and interface are huge deals on handheld systems, and a lot of developers seem to miss that.
Then again, playing Day Of The Tentacle on my DS (that was how I first played it) was a great experience, so it's entirely possible for an epic, classic-style adventure to work in that format, even if it wasn't designed for it.
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"I think it's the idea that counts, not the actual method. As long as you set out to cause a horrible death through insects eating the person, you're good." - apenpaap
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