What is in your opinion the best team syngery bonus and the worst?

Basically two civs that benefit from team bonuses have civ bonuses that cover up each other weak points or helps each other in general.

My favorite are the team units with the fast buildup time in certain military buildings or the civ bonus using the unit itself (looking at you Berbers and turks😉). I also like Portuguese and malians since faster university tech upgrades allows the Portuguese to utilize gunpowder units much faster and build defenses quicker as well which couples with their gold discount and sokid defenses makes them a dangerous post imperial civ.

Least Favorite would have to be Spanish and Incas since the farm increase bonus so insignifcant that it amounts to why bother?