You can compare the differences any way you want. But comes down to two things.
1. Target: Audience: Wii/DS = Casual Market and main target is children - young adults; PSP/PS3 - Teenagers - Adult.
2. Price= Wii/DS is less expensive compared to PSP/PS3.
These factors have the most influence imo. Overall in quality PSP/PS3 wins hands down.
Also why is UMD a failure? Even if it other products don't use it. PSP is doing fine and as long as the psp is around it's here to stay. I like the steps Sony takes in trying to get products out there. I like the old Mini Disk idea and UMD is another cool format. Man, Even Betamax is still getting used by TV stations. Sony make some good quality shit :P








