There are only two sites with router reviews that I know of and they are not very comprehensive and quite dated click here and click here
It can depend on what you want from your router, e.g. some are easier to configure than others, some are known to be better with longer lines than others, some have better wireless coverage, some have extra features that can be accessed to allow increased performance or stability.
A good all rounder is the Speedtouch 585. It is known to be stable with long (or shorter) lines, can be tweaked with the aid of a software tool to increase performance or stability and the wireless range is adequate.