I have a swivel at the first stage/hose interface, and an angle adapter at the hose/second stage. The swivel tucks everything in tight and going in the right direction, and the angle adapter allows the routing where I want/need it.
edit: I'll clarify by stating that I have a factory non-swivel 1st, and have added swivel fittings to allow for better alignment of hoses (both HP & LP). I have it set so the HP goes straight down on the left, long hose goes straight down on the right, and LPI goes straight forward. The other hoses are not on swivels: DSI goes out and around (actually under left arm), bungied octo is out and around. Both seconds use angle adapters to keep hoses close.