Merchants - for most of my cities.

Warrior Guilds - Hospitallar/Templar for fringe cities - citidal if possible.

Swordsmith guild - for my Castle

Then fraction specialisation guild - (horse? woodmen?) for the other places.

I normally rejected these unless I got really bored or else invade and cant be bothered to change - Thieves, Assassin, Theologians

I won't even consider Mason's. but i would accept one if i am bored enough.

Consider this - Gold and Men are the sinews of war, anything else are just toppings.