I've used both. Yes, it's louder ... but you can use insullated ducting and excessive gorilla tape to completely quiet the bitch no problem.
I have 3 or 4 Valuline in use now, and they've been going for over a year. One of them crapped out on me a couple weeks ago. It started to make a LOT of noise. It was approx 2x louder than any other fan running. In it's defense: it was running at full speed for over 1 year STRAIGHT. Never shut off. All of the other fans I use are modulated by temp or shut off completely during dark hours. I probably shouldn't have put the cheapest fan on that duty, but live and learn. I've replaced that fan with a Vortex and it's running fine (it's only been a month or two though).
Plan on using insullated ducting and you'll be happy with either fan. The Vortex DOES move more air... but the Valueline moves enough to get the job done.