Quick googleing search of the strains your listed.
Chocolate Thai = unique chocolate-coffee aroma.
Dark Chocolate by SoCal Seed Vault = smelled very sweet, almost like whip cream also has lots of chocolate Thai in it.
These 2 strains could potentially give off Vanilla/sweet/whip cream & lots of chocolate coffee aromas from the genetics background from the chocolate Thai.
These 2 combined could a easy winner…
Just be sure to use Pollen from the Dark chocolate by SoCal (Vanilla/Sweet) and inpregnate the chocolate Thai as momma for F1.
Then BX the best Vanilla/Sweet sented with Chocolate thai… I bet this would be amazing…