I like to top mine.
some Ill just Tip Once some I'll do 4 times...(wait till the seedling is atleast 3 sets of leavs high before you top it.).
I do Outdoor...
I also Tie down and snap.
The theory behind Tying down is the Main stems get equil amounts of sunlight along the lenght of the Main stems.(wich produces more bud).
instead of just the Tops getting the Main Impact of the light the whole plant system gets the light More evenly...
(an old rose grower taught me that trick on my 5th grow.)..and i have never looked back.
stressing is a whole nother story that Im Going to Make a thread on when I get round to it..