Loving the Shield since I can take a few hits. And once I found a wild Pistol seed spawned that thing easily killed three enemies on screen
This isn't a favorite, but: if I see that a seed can damage me, I pretty much avoid it every time. Once I laid down a homing seed without getting out of the way immediately, and it immediately spawned a missile and killed me, so now I kinda grumble "ugh never again" and go with a seed that can't hurt me.