Up to you. This way you know your going to get female plants so you will get bud. If you get regular then up to 50% could be male. It is pot luck how many are male also you might not fancy wasting your time and light power on what could be males until you sex them. Personal choice.
Dude the best advice you will ever get is always buy all Fem!!! And you must be an idiot if you want to waste your time and light on mixed seeds for what did you say $6!!! Fuck you idiot. Sorry but you have to be to ask that and say that is all the $ difference. I don't grow anything but taco plants anyway... moron.... $6 to mess with male seeds. IDIOT LIAR.... Ban this cop!!!!