Resilient Life contains Xerneas and Aromatisse, both of which are really good cards. I personally don't know what AAA Pokemon there are in Brilliant Thunder, but I'm sure you could probably make use of that Deck's Heliolisk to search out Rainbow Energy, which can then be moved around by Fairy Transfer. It's not a fantastic Combo, but I think it's pretty solid for a starting choice.
As far as attackers for the deck, Xerneas and Pidgeot are probably your best bet for what comes with the 2 decks. If you can shell out the extra cash, I feel that Xerneas-EX is probably the best Fairy Type attacker right now. Other good attackers that run on [C] Energy include M. Kangaskhan-EX, Mewtwo-EX, among others.
The trainer cards that come with the Brilliant Thunder deck are good, but I don't think they mesh well with Aromatisse. If you choose to go the Fire Type route, then Torkoal is a pretty okay attacker that speeds up with the help of Blacksmith. Other good Fire Type attackers that don't cost that much money include Blaziken from Furious Fists, Flareon from Plasma Freeze(Which uses Colorless Energy), and Reshiram from Legendary Treasures.
The Psychic Types in resilient Life are pretty awful, and the Pokemon they evolve into are either expensive(Trevenant, Gourgeist), or overall bad(Arbok, Grumpig). Stay away from Psychic Type for now.
The Lightning Types are pretty solid as well. Luxio is probably the best one in Brilliant Thunder, and comboes well with Milotic from Flashfire and Cofagrigus from Plasma Freeze(The one with Slap Of Misfortune). Though, when you can get enough money on hand, I would say Lucario from Plasma Storm(The Holofoil One) is the best Revenge Attacker out right now, as it's damage output is much higher than Luxio and he has more HP.