Graphs comparison placement

I'm exploring ways to demonstrate graphs in comparison.

More specifically a web tool I've been working on needs to visualise a "Control Group" and an "Experimental Group" in a parallel way.

One solution is to design the graphs in "drawers" so that the user can slide them accordingly.

Few of the issues that arise are:

• How not to favor one group over the other
• How to rearrange the layout in such way to reserve as much space as possible
• How to present the information in a way that the user instantly understands the value of the comparison
• How to handle large amount of variables and avoid clutter.

Any comments would very helpful.