I can talk a little bit about the Seneca. It is a workhorse. It is not a very fast airplane but it is extremely easy to fly and forgiving. It is used by flight schools all over for that reason. With that said, the side visibility is terrible with those huge cowlings, although that shouldn't be an issue if you are considering a low wing multi
. Its a plane that looks like it has more power than it actually does. On a side note, it is a piper so its cheap to maintain and most mechanics will be able to handle it, the beech is another story. I would obviously go with the Baron but I am extrmely biased and so are most people here I think.