Fantasy Zone! More faithful to the arcade version than the SMS version(to be fair the SMS version was developed concurrently with the arcade version and it's never supposed to be a perfect conversion) and MUCH better music than the PCE version(which was a shame, as the PCE version did every other thing right, but music being a high point of the game, there was no excuse in making them sound like crap). And this was the first game I got with the system.
So, I'm afraid I can't relate to your lust for Japanese Famicom carts. Most of the good stuff Nintendo localized and I probably beat it thanks to rental mania back then. The NES and SNES were fantastic, well-supported systems and it was a privilege to grow up with them.
I don't agree with this though. In here(Hong Kong) BITD the NES failed completely. One main reason was that the game library of the NES sucked(bad localisations with censorship and other changes, lack of RPGs
and Koei strategy games), and as we live in a PAL territory the PAL game library sucked even more. As we have a very free market people are used to having imports, so the imported Japanese Famicoms triumphed the officially released NES in every single way. Another reason was the removal of the expansion audio pin on the cartridge port(actually moved to the unused expansion port), making a number of games sound inferior on the NES and the inability to use the FDS(which was VERY popular here, for many "reasons") fully without jumping through hoops on the NES.
Though it wasn't really common to have TV sets compatible with both PAL and NTSC in the 80's(and early 90's), some people here just had their Famicoms (poorly) modded to output to PAL(which someone claimed might even damage the TVs after a while, among other compatibily issues) or, for more serious gamers, just bought a NTSC monitor(which many people already had, as Apple ][ clones were very popular here) and had their Famicoms modded to output to AV.
That Nintendo eventually produced a Hong Kong edition of the Famicom(supposed to have better compatibility with Japanese carts and output to PAL) late in the console's life should be an indication.
I think the SFC/SNES situation was similar, but less severe(I'm not really sure as I didn't care anymore, since the PCE was the last console I owned). The lack of any DQ games and the mess with the FF games on the SNES were good enough reasons to have the Japanese system instead.