an oudoor grow takes 7 months start to finish, if you start in spring, you will have an harvest end of summer, or fall.
if you grow indoors, you would vegg for 4 to 6 weeks, and then goto 12/12 for 8 weeks or so, depending on strain.
so growing indoors, you will get weed in half the time.
if you grow outdoors, it is also worth it cos, if you plant early in spring, you will have ganja tree's by fall.
why not do both.
stavias are best for outdoors, and indicas, are best for indoors.
depends how fas you want some free weed.
its a long grow, growing outdoors, and you can have all sorts of problems.
plus if you grow indoors, you will need cfl's for vegg, then hps for 12/12.