Second assault got the worst maps in my opinion.
The maps just were not designed with modern BF4 weapons and gadgets in mind.
I tend to play mostly Dragon's Teeth maps, along with Zavod and Outbreak.
Vehicle combat in BF4 is not all that satisfactory - in ground vehicles it feels too easy to just run away from other ground threats, while in air vehicles the MobileAA truck feels incredibly overpowered.