wild magic vs guitar melody?

plz someone tell me which buff is better concerning the m.crit rate:
guitar melody-increases party members' p. critical rate by 32%, p. critical damage by 35%, m. critical rate by 20 and decreases mp consumption for physical skills by 20% and magic skills by 10% for 30 minutes. also decreases mp consumption for iss enchanter's buff skills by 20%.
or
wild magic - for 20 minutes, increases by 2 the damage rate of magic.

 

both same if im not wrong.
u'll end up getting +20.

 

and btw do you know how to check the amount of the m.crit rate?
and what means if you have for example 170 m. critical in the character status bar, does it mean 170 m.crit rate and 170 m.crit dmg?

 

m.crit rate
you cant really check it like this in wild magic buff/augments/valakas unless you have them.
valakas +20
wild magic augment active+passive each +40
wild magic buff should be equivalent to guitar melody lvl1 with +20.