You asking this on a website that is going to vote overwhelming one way and thats to whatever fits Nintendo or Sony by your choices. I voted see results because I vote both, which the DS,gameboys and PSP offer. For example there was the Game and Watch series which was a lot of "15min fixes", but is on a Nintendo handheld. Theres a lot of examples of games that can be taken in both ways. It all leads back to why games cannot be considered hardcore or casual. They are just games made for us to enjoy ans as long as they do that they have done their job. I would also add I dont game on my phone or play games like the Facebook ones on my CPU. I use my CPU to visit forums and do my powerpoints/papers/ and other projects on. I use my phone to get in touch with someone. I use my DS and PSP to play games and nothing else.
