Power Stone 1 + 2: Dreamcast Versus PSP and Pricing

[Nz17]

I have been well aware for a long time that Power Stone 1 and 2 have gotten to be expensive for the SEGA Dreamcast (about $60 or more for game-only each). I also know that the PlayStation Portable (PSP) got ports of both on one UMD (about $20 for game-only for them both) which might be cheaper for the Japanese ones. And as you might imagine, the Japanese Dreamcast copies of Power Stone 1 and 2 are much cheaper than the North American and European Dreamcast copies (about $30 for game-only each). What are the pros and cons of each choice considering price and features? I'm leaning toward importing the Japanese Dreamcast copies eventually, but I'm not sure.