with hybernate the system wrights the info to a file (you need to check a box in config powersupply) Because of that file you lose a bit of diksspace. Some systems realy bennefit from this, others don't.
The other thing is standby. Than the ram has to be powerd at all time, drains your battery, but bootup is quick.
Ps you can chanche the settings on your m2 by change the possition of the jumper.