I really feel it from preacher curls and BB curls. I've also read that preacher curls are good because they work the muscle that's under your main bicep which will make your arm swell up and will improve your peak.
Yeah, hitting the brachialis is important, it also helps your triceps.
I do
Standing barbell curls
Incline dumbell curls
Preacher curl
I also have a back/bicep day