six, strains, which 3 should i grow together??

Hi all, just about to start my 3rd grow. I have got 1 each of Black Widow, Northern Lights and Super Skunk. Freebies are il Diavlo Auto, Black Rose, Northern Light Blue, and White Widow x Big Bud.
I have .76m x .76m x 1.8m, and im planning on the Diavlo auto with 3 of the others.
Any advice on which 3 i should plant? I was thinking of having a try at LST with them.

Thanks in advance for any opinions.

Smiv

super skunk, northern lights, id try the bbxww combo too