>>16475146
>Preferably in japanese
That gives you a lot of options.
For Langrisser 1 play the PC remake from the late 90s. I think it's called Swords of the Dramatic War or something like that.
For Langrisser 2 both the original on the Sega Genesis and the remake, Der Langrisser, on the Super Nintendo are worth playing. The have the same characters and can have similar plots depending on which path you choose in Der Langrisser, but they're very different games overall.
I haven't played Langrisser 3, but I assume the PS2 version is better than the Saturn one.
Langrisser IV and V are best on the PS1 if you want something more balanced. If you want to break the game by abusing very broken units, then you might prefer the Saturn versions.
I'm only familiar with the PC version of Growlanser 1, so I'm not sure how it compares to the PS1 and PSP versions.
Growlanser 2, 3, 5, and 6 are only on PS2 as far as I know.
Growlanser IV(aka Wayfarer of Time) is best on the PSP because of the insane amount of new content they added for that remake.