senegals always seem to be the first bichir people get (and the most common species around). Very active for a bichir and not that bad looking
They are all basically the same to care for, some have differing tank size requirements due o their adult size.
I definitely agree that Polypterus senegalus is an excellent 'starter' bichir and it is certainly the most commonly available. Polypterus palmas polli would also be an outstanding choice. It is as active as P. senegalus, grows to about the same size, and has the added advantage of having a nice pattern.
Pretty much the care for one is the care for all.It's just some species tend to be moe active than others .So you might as well star off with something more active-Anne