Agreed with above. In most cases, you will never use med 1 over med 2.

Unless it is a situation that does high aoe dmg in a multisecond window (a3s for example) then med 2 is always the better choice. Medica feels more like the aoe you want to burst spam 2 or 3 times or when the party is only missing 1 or 2k hp. Just not many situations this happens in