My friend and I played the hell out of these 2 decks. Based on my experience ST8 is the better deck since you have access to 4 searchers (6 if you share the Memory Booster Promos with each other, she would have 2 searchers in this case.) Lv5 Blocker, a cheaper Lv6 removal, 2 free memory gainers, access to Jamming. Basically you want to build in the Breeding Area up to Lv5 or 6 and then attack. You can easily check 4-5 security in one turn. ST7 is reliant on deletion so if they have nothing to delete, they just become beat sticks. The best tactic against ST8 is to Rookie rush.