For me, it's the selftitled debut album, "Falconer"!
I like the raw energy of the songs and the recording quality!
In addition it has a very high emotional value for me. After all "Falconer" and "Chapters from a Vale forlorn" were the very first albums of this truly brilliant band, that I checked out. That was a intense time, pretty long ago.
Of course, the latest two albums are also very high up on my list