LogFAQs > #979720797

also the reason for those 3 is simple:
Alpha 2 and Star Ocean were the only games that used an additional chipset with the SNES which was used for graphic (and in SO's case, map) decompressions. they couldn't be emulated for the longest time for that reason. Tales of Phantasia and Star Ocean both used the largest size carts possible on the SNES and even had things like reflections in mirrors or water, though the former managed to cram everything in normally, as opposed to the latter which used the extra chipset for map and graphics. decompressed SO is actually twice the size of ToP so on a technically level, the answer is Star Ocean. but for a whole package, might go to Phantasia. and then there's Alpha 2 which was trying its best to pull off visuals from arcades and later consoles.