You do realize these towns are an hour apart? Presumably the reasons for your visit drive which hotel you will need to stay at -- it's not as though these two hotels are down the street from one another and it's just a matter of choosing one.
Having said that, I have never stayed in Corvallis but did spend 23 weeks "living" at the Hilton Eugene & Conference Center last year while on business travel. That's where I earned Silver, and Gold, and Diamond.
What would you like to know about it, or Eugene in general?
SEA2BA