The Subsistence versions have been altered. Both have new translated dialogue that is different from the originals, new difficulties and modes that reflect the Solid games and some of the characters have had their names changed.
MG1 looks basically the same however MG2 has new portrait artwork for the codec, intro and ending similar to the Solid Series and almost every character has had their name changed. Both games have a new Boss Survival mode and unlockable bandana.
Yea I'd recommend the originals over the updated ones. I found the new translations made a lot of the dialogue more silly plus a lot of work went into the unnofficial fan translation of MG2 which strived to be authentic and true to the original and deserves recognition.