This is a list of my favourite 5 archetypes.
Cyber This archetype features very powerful machine monsters like Cyber Dragon which can become Cyber End Dragon.
Evil Hero Evil Hero is a powerful archetype with improved Elemental Hero versions of cards with much better effect than the orginal.
Crystal Beast Crystal Beast is an archetype that isn't very powerful but allows the monsters to remain on the field by going to the spell/trap zones. They are good for Hamon, Lord of Striking Thunder and Rainbow Dragon.
Neo-Spacian Neo-Spacian cards aren't very powerful but have good effects and do well with Elemental Hero Neos.
Elemental Hero Elemental Hero is an archetype with a variety of cards and works well with Neo-Spacian decks. They rely on fusions and there are many good fusion monsters.