If you're talking about a short length that connects the pump and the pickup to hardline, I prefer hose so that there's no threat of vibration cracking the hardline. If you don't have enough room for a large radius of hose, use a 90* AN fitting, which are available from Earl's, Aeroquip, & etc in a couple of different types; I prefer the softer turn that's a short length of tube with a Female at each end, rather than the tight 90* elbow, as they flow better.