Metals are good any time bluefish are around. If they are chasing bait you will see them. If not use a heavier tin and vary the retrieve until you see what they want.
Bait is good for when the current slows down, like near slack tide. Otherwise you will spend all your time peeling weeds off of it. One difference is if you are going for tog in the rocks with crabs. They will find the bait in most stages, but tend to back off a bit when current is strongest, and i have not found them to be most active at exact slack, you need a small amount of current for them. Hope this helps.