Go for Feminized I rate. Your space is very limited so you need the assurance that the seed will turn out female. There is a small chance that a feminized seed will turn into a hermie but that chance is very small.
To minimalise that small risk I reckon you should grow 2 or 3 feminized seeds and grow them fairly short, veg them to around 35cm high and then flip them to flower. Incorporating some topping and training too if you know how, to create an even canopy of a colas on each plant. That's my