Joe...you're growing...autos?
What effect are you looking for? Northern Lights is a pure Indica and is known for its couch-lock properties. Gorilla Glue is a hybrid that leans to the Indica side, but there is still plenty of sativa in there.
They will stay small...why can't you grow both of them?
I have grown the northern lights before (photoperiods) and have always liked them. I will be growing some NL5 x haze in the fall in the tent, which is a nice sativa hybrid, but I am doing a little experiment now.
I have a sunny secluded yard and have always wanted to try growing in the sun instead of a tent, and the virus lockdown gives me the chance to try a quick grow this summer outdoors, which is why I have chosen an auto so I don't have to worry about the day lengths.
I will grow it in a fabric pot (11L) in soil and not do any LST or anything to it since the sun will be equally strong from top to bottom of the plant. I would like to plant it directly in the soil, but I am not that confident that I might not have to move it if someone has to come by to work on the house.
I also have a glass greenhouse on the property, so I plan to let it sit outdoors in the day and move it into the greenhouse at night because it can get a bit chilly at times even in May and June here (I'm in the UK). I have never grown pot outdoors, but if my vegetable crops are any example, I expect the bugs to eat most of the crop. I have some broccoli in the ground that is currently being ravaged by worms eating the leaves.
I long for the day when I can grow openly outdoors in the soil, so this is just a little experiment and I don't want to mess with more than one plant. If the smell gets too bad in flower, I may have to finish it off in the tent. I think that the northern lights may be a bit less stinky, so I may go for that.