Cambodia's Buddhist tradition is not as old as that of Sri Lanka. And the heydays of Anuradhapura predate those of Angkor. This is to say: The huge monuments of Sri Lanka are earlier than those of Cambodia. However, Cambodia's temples are much vaster than those of contemporary Polonnaruwa, and very spectacular indeed.
Our new Cambodia website about Angkor's heritage attractions, which will be the most detailed one you can find online, has been started yesterday. Just one of estimately 200 pages is online now, viz. about the medium-sized Buddhist temple of Ta Som - as a sample how the temple descriptions will look like. Have a look at http://www.angkor-temples-in-cambodia.com/ta-som.html. We will keep you informed about further uploads on a regular base.
Nuwan Chinthaka Gajanayaka