High...

I've tried many grows both pruning and letting them go. A lot of it depends on your grow space height and whether you're growing the same variety so that the canopy stays fairly consistent and receives maximum light. I don't tend to keep topping throughout the grow unless the growth is getting out of control. We all know that it can be a real challenge to tame the height of this herb in an indoor environment. I also continuously look for new branches coming out of stems and pinch off the lower ones.

By limiting the number of main branches and removing the lower third of the plant's growth which will see very little light anyway, you end up with much less work when it comes to trimming. It takes much more time to trim around lots of little buds and very little time to trim around large colas.

When the plant is small I top the plant and then choose 3-4 of the strongest shoots on the main stem as the producers and I cut off all the other new shoots. After I put them into flower I'll remove any growth on the lower 1/3 of the plant that is heavily shaded by the canopy. Topping and trimming excessive lower growth helps control the growth of your plants. The energy of the plant then produces large flowers on the remaining branches. All of the producing flowers will also receive more intense lighting as well since all of them are growing closer to the canopy height than they would be if the buds were spread out on taller plants with more small branches.

Give your plants a couple of weeks to recover from trimming and get back to a positive growing stage or if you're really needing to keep the height short I've found that you can put the plants into 12/12 right after pruning and it will delay the amount of time they take to start growing again. Depending on how much room you have to flower in you'll usually want to put your plants to flower when they are 1/3 to 1/2 of the height you have available for them to grow and still maintain a safe distance from the bulb if you are using HID lighting.

You'll have larger buds and much less work at harvest time. I haven't had a safe place to grow for awhile but for my last closet grow a couple of years ago I had 2 plants under an air cooled 600w HPS along with a 8 bulb T5 fluorescent fixture mounted on the back wall of the closet and a single 48" Philips UVB fluorescent bulb in a shop light fixture that was on 6 hours per day. Due to height limitations I did some very aggressive pruning and I ended up with 3.5-4 oz of killer dank per plant. I'll dig up some pics soon...

Happy Growing!