According to https://shmups.system11.org/viewtopic.php?t=46230 there are version differences that may or may not affect gameplay between different versions of XII Stag.

Dont know what they are, seem to maybe be related to auto back fire and some old issues in the MAME project.

Either way, for that reason, we are going to split the Platforms up into different subcategories.

If anyone has any further information please chime in here.

Thanks all