Starting new grow..seed choice?

Currently growing White Russian, I want to start two more strains, Sensi Star for sure, but the other one's I am looking at are Nebula and Big Bang.
The Big Bang seeds I was looking at were 5 for $35, and the Nebula were about double the price.
Any experience or recommendations?

Nebula all day.

ya iv never grown or smoked either but Iv heard so much more on nebula think of looking up at the starts haha