This is definitely an interesting phenomenom I've observed over my gaming career, which started with the Famicom back in 1984...
I moved to the States during 1990 and I bought a TG-16, fully knowing its the US version of the PCE. Knowing PCE's awesome selection of games, I actually dreaded seeing the TG-16 get its rear handed to it on a plate by SEGA Genesis... it pained me as a TG-16 owner... Later on I bought the TG-16 CD unit and started getting into import games, which made life better as I was able to show off Gate of Thunder to my friends in school about 1 year before they brought the Duo over to the States
I sold off all my TG-16 stuff in 1997/1998ish, and recall during then the US counterparts of TG-16 stuff was worth very little on the secondary market. This seemed to make sense given the Hucards NEC Americas chose to bring over were really crap (Yo Bro! ? Timeball? Sonic Spike Volleyball? etc..)
Well I got back into PC Engine gaming recently and started buying up stuff in Japan during business trips there. I am blown away on how well designed the original CD-Interface unit is, how compact and awesome it is given it came out in 1988! Then a question hit me... what has happened the last 10 years+ that suddenly made US-version of TG-16 / Duo hardware so much more desirable?
I notice the US version hardwares; i.e. TG-16 units, and Turbo Duo, command much more prices these days on Ebay... But why? Very few US-exclusive Hucards are good ... Magical Chase is the one that comes to mind with special pluses over PCE versions. Also sure, you can play good games in English like Cadash and Dungeon Explorer, but the US-CD rom games are compatible with JP hardware, so why would people shell out more for TurboDuos? I saw some dude's TurboDuo set go for over $700 on Ebay that just doesn't register
So, what do you guys think? JP Hardware with access to its Hucards librarray plus all CD games or US hardware with access to US Hucarrds and all CD-roms? I go for the JP versions...