If it's your first grow, just use bagseed. I killed a lot of my plants early on and I'm glad I din't waste money on expensive seeds, just so I could kill them. I've got plenty of seedbank seeds now, but I'm still using seedbag seeds to experiment with different soil mixes, nutes, and growing techniques. I want to make sure I know the best ways to grow with what I have.
Lately, I've been practicing LST with a strongly sativa clone. If the original plant is female, I'll be keeping this one as a mother. Maybe once it get's a bit older, I'll top it in a couple places and see what sort of harvest I can get.