I have no beta on fishing charters outs of Juneau, others may but in the mean time I suggest you contact a few, ask what they offer and ask for a list of their past clients, and then contact them. If you get nothing but positive reviews or they will not offer a client list, go elsewhere. I always sent the list with every contact to me but know, not every client will allow their name to be used but most will because they want to tell someone, everyone their Alaska story.
A good question to ask is, most charters run a boat limit meaning you can catch no fish and one guy can catch them all as long as the boat does not go over the limit, then the fish is divided up on the dock. Others allow you to keep what you catch.