The new prowler has a 33 blower, a 15hp engine and direct drive, however even my 13hp prowler with it's 24 blower gives phenomenal suction (lifts the carpet off the floor). I have run it with 150ft hose including 50ft of that being narrower 1.5" hose and the suction was still awesome.
I lifted my Prowler off the van by myself yesterday so that I could use the van to shift a bed for the mother in law, it took my literally a couple of minutes to get it out.
Today I've got 8 bikes going in the back of the van for a hire, basically what I'm saying is the prowler gives me the performance I need and it is also easy enough to lift out to give me flexiblity to use the van for other jobs.
I'm sure the Spitfire is a comparable machine, possibly even better on paper, however if you weigh up the purchasing costs, running costs, performance, ease of servicing (any honda recognised dealer can service the Prowler and will carry spares), reliability and flexibility, then you will probably settle for the Prowler..............I did and am more than happy with my choice.