Carlton: Oddly enough, I stopped at US Chili for lunch for exactly the same reason....had a dentist appt in the morning then came south on 75 around 11 today and decided, what the heck, might as well find out.
Mr Mayor: I finally get to answer your question :-)
The differences I noted:
No parking
Camp Washington has a parking lot, US Chili really doesn't. I guess you could park at Camp Washington and walk across the street to US Chili, but I doubt the propritors of Camp Washington would much appreciate it. Best bet is a parking meter, 25 cents should be enough unless you're plannign to linger over a breakfast
Hours
Camp Washington is 24 hour joint, 7 days a week.
US Chili is only open for breakfast and lunch for the most part (M-F 6a to 4:45pm, S 6a-2p, closed sundays)
Chili
Camp Washington has a very good truly cincinnati-style chili that I consider to be one of the best (top 3 or so) in the area. The chili at US Chili is more like a gravy or a sauce.....somewhat less meat, somewhat more like a cream gravy. I found the texture a bit disturbing. The hot dog literally slipped out of the bun in the chili dog I ordered, I mean it was almost like a lubricant rather than chili. I thought the taste was fine, but the texture was waaaay off.
Other than these three differences, most everything else - menu, ambience, obvious focus on double deckers and breakfast as well as chili - was very much alike.
But given the difference in the chili, were I to stop by in the area again, I'd always choose Camp Washington.