Sorry.. no argument to be had here. Sheer value for money = scope.
Telescope.
The lens you'll need in order to take anything close to reasonable will probably cost more than a decent scope, so unless you already have a nice long lens, buying one for this purpose makes no sense (unless you also need it for other reasons). If it's investing in something just to take lunar images, then a scope offers the best value for money. It's obviously useless for shooting anything else land based though as astronomical scopes invert and reverse the image.
With a lens, you're going to need something in the order of 400mm plus, and even then you'll be cropping into the image quite severely.
£200 to £300 will get you a reasonably good telescope, that will not only allow great astro-photography opportunities, but also a great thing to have in it's own right, as just gazing at the stars is an amazing thing to do.
When buying a scope, you need to ensure that it can actually focus into a SLR body. As most scopes are designed to be used visually with an eye piece, most can't focus an image clearly into a camera body (which is set further away from the scope than the eyepiece normally would be).
A popular model is the Skywatcher series of scopes, and the 6" Skywatcher 150P. I can guarantee it works with all DSLRs, because I have one.
Reflector telescopes offer the best optical quality as they do not suffer from chromatic aberration like cheap refracting scopes do.
You'll also need an adaptor ring to mount the body to the scope.
To shoot anything more than the Moon though, you'll be needing motor driven equatorial mounts, and some kind of tracking.... which get's VERY expensive if you want to do it properly, and is a discipline way beyond photography itself. A whole new science and hobby in its own right, but shooting the moon is easy enough as the shutter speeds are high.
Taken with a Skywatcher 150P 6" scope, and a Nikon D7000