What do you mean with "most trustable wallets" to use?
With brainwallet OP referes to wallets generated from a password which will be stored in your brain.
So 1) there is noone you would have to "trust" as a 'walletprovider'. And 2) There are far better options for a wallet.
With normal passwords you are cutting the search space for the priv key to ~1/20 compared with some RNG (considering enough entropy).