Map Rarity & It's Effect On Maps

Really curious as to the main differences between magic maps, and rare maps.(obviously rares have more modifiers) But like is there a cap on quantity/rarirty/pack size mods on magic maps compared to rare? From what I've seen it seems like rare maps typically roll higher, but I wasn't sure if there was breakpoint between magic and rare maps.

Not so much a breakpoint as a magic map can only have 2 mods while a rare can have 6 and a corrupted rare can have 8. Each mod adds to those amounts.