I'm not so familiar with venoms, but I've had good luck with Raiders and 10-man squads with a dark lance in it. my only complaint, though, is that every army I've come across has made it a point to take them out before they do any real damage, which either works or doesn't. With either boat, if any firepower gets leveled at it it is TOAST, but usually you get one good shot at something before you get a rocket up your shnozz. If you're taking the 4/5-man Trueblood teams, i think that the venom's probably the better choice as you've got enough neat weapons inside it to accompany some splinter-y goodness, but with warriors I like the raiders and 10 man squads better because of the option of seating them in some cover and running your gunboat across the board to give a Talos or that suddenly vulnerable witch squad some sudden cover. Happens more than I'd like to admit.