What are the purpose of the six hunting styles?

There are six ‘hunting styles’. They are as follows:

• Guild
• Striker
• Aerial
• Alchemy
• Brave
• Adept

What’s the point in choosing one style over the other? What is each one supposed to do for you? Is one maybe meant to assist you to become a tank, or a support class, for example?

Ok, Firstly. There are only 2 new styles to Generations Ultimate/XX. Those being Brave and Alchemy. I will still run down the four original styles as well, though:

Guild: Traditional hunting, there's really nothing special about this style, it feels most familiar to monster hunter veterans. All-Rounder. 2 art slots

Striker: Artful Hunting, This style excels at building your hunter arts, letting you use them more often. Offensive. 3 art slots

Aerial: Aerial Hunting, This style replaces most weapon's dodge with a hop. allowing you to land aerial attacks more often and get mounting done. Offensive. 1 art slot

Adept: Defensive hunting, This style strengthens dodges and blocks, giving counterattack abilities, and makes living easier. Defensive. 1 art slot

Alchemy(new): Supportive Hunting, You are given a special barrel item that produces unique items and effects that recharges. Supportive. 3 art slots

Brave(new): Offensive Hunting, Heavily altered movesets for all weapons, Parry ability used to charge the brave gauge for unique moves. Offensive. 1 art slot

All styles alter weapons slightly in some way, (like the gunlance can't shell midair while using adept style, for example. I don't think this is the exact case, this is just an example.)