1. Watchtower -> Secret Chamber is useless most of the time, wonky, and just not a lot of fun. No contest.
8. Secret Chamber
6. Caravan Guard
3. Trader -> Caravan Guard is boring and weak. Also no contest.
5. Moat -> This one is more difficult. Moat can be the draw in an engine in a pinch, while Horse Traders can be the +Buy in a pinch... Moat's reaction is stronger though, just blocking the attack altogether. I like Moat.
4. Horse Traders
7. Beggar
2. Market Square -> I've had so much fun using Market Square as a payload card, even if it's wrong.