Not entirely sure but from what i have seen on here and this is only the feeling i get from being on here for a few years
a) you'd have a bigger market for selling the Osprey to. They are highly rated and appear fairly desirable, not many bad things are said about them anyway. Meant to be good build quality. (You should know!!!
b) from looking at the hulls, the revenger looks a faster boat rather than seaworthy boat, that's not to say it isn't seaworthy, just it looks a more pointed shape from above and from the side, ie the deadrise is different. The one's i have seen on here only have either two or a minimal amount of seats and look like they could be used for racing, (i think it is a racing based hull??) Haven't heard many bad things about them either.
I'd have the Osprey! but that's just me. It does look a nice boat and if the figures are correct, a good example. All dependant on price.
As for price. And this is just me! I'd hazard a guess at a new 7.5m hull and tubes being 25k, plus 15k for an engine and another 5-10k on trailer and fitting out. So just shy of 50k. Based on the fact it is 5 years old, it will probably have halved with regular leisure use after 3-4 years, certainly
by 5 years. It looks in good nick, average leisrue use is say 30-90 hrs per year. So it is just under average mileage in car terms. I'd take a stab at being £25k, but only worth £20-£22k, though I wouldnt pay half it's new price or more for sure. If he's unsure of selling it, it is likely it is overpriced. Remember, i am no dealer though!!!! It's only worth what someone will pay.
For example, a cheaper brand and 2003, but similar size advertised at 16950, probably go at 14/15
Ribeye 785 - 200hp V-Max - £16,950
Both nice boats, horses for courses and all that. Depends what you are using it for.