What's the difference between game A and B in RE2?

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I just finished Claire's game A, and I was about to start Leon's game when I noticed I could load the save I finished the game with Claire on Leon's disk (game B).
What's the difference between game A and B? Do I need to play them both to get the story/whatever?
Sorry if this is in the wrong section.

basically you can play leon A then claire b
or claire A leon B

the difference is, you can see the story in a different way if you play claire then leon.
try it you can unravel more of the story

and the b senario is a little longer than a

Alright, thanks guys.

The final boss is different also, The B boss is a huge different and a lot more fun killing it.

I should've played Leon

*you start off on the other side of the wrecked semi and police car

*deeper storyline

*New characters

*longer gameplay

*TYRANT (Guy in green jacket which I used to call him in like 4th grade)

*New Final Boss