Hose clips expand and contract with the change in temperature of the pipework, giving an almost constant force on the rubber join. The force is determined on manufacture and is not adjustable.
Jubilee clips remain fixed and as the temperature of the pipe increases and the pipe expands the clip pressure on the pipework increases and the clip digs in to the hose, potentially causing early failure. The force exerted depends on the amount of grunt the wielder of the screwdriver uses, and can depend on how many beers consumed/temper/frustration/hurry/stress etc etc the assembler is experiencing at the time.
Hose clips every time for a "proper" job.
Just how much does the pipe, hose and clip
actually expand, bearing in mind that we are talking about fairly small changes in temperature? It's probably a very small increase, and I suspect that measuring it will be tricky. The differential between the three parts is going to be even smaller. Which makes the 'constant force' more of a theoretical reason rather than an actual practical one. Perhaps someone with some technical engineering expertise could come up with some numbers, Or someone with more time than me actually take some measurements.
I dislike and distrust the sprung clip, and always replace them with quality(usually genuine Jubilee) clips as I've never had a problem with them in use or fitting, which is not something I can claim about the spring type.