The Eternity - Alternative 4 - Judgement run is my favorite era of the band. If I had to pick ONE favorite, it'd be Alternative 4.
They were initially part of what people called the "Peaceville three", with Paradise Lost and My Dying Bride - which I always found kinda funny, since their "death-doom" phase was such a brief part of their story. It really only includes the debut EP Crestfallen, their first full length Serenades and their subsequent EP Pentecost III - these were all with original vocalist Darren White. Even their following record, A Silent Enigma, while surely somewhat related to that genre, was already something different (some great songs in there, btw - check out Restless Oblivion and A Dying Wish)
Then the Pink Floyd influences definitely took over, but within a sound that was very much their own. The three albums mentioned above are excellent. Gothic, doomy, gloomy and "dreamy" all at the same time ..although Judgement was already a bit different...more "positive", if you will (The original bass player Duncan Patterson had left after Alternative 4, and I believe a lot of the darker stuff left with him...)
Of their latter, "positive-minded prog" phase, my favorite is Weather Systems, although the quality is pretty consistently high. I just have a slight preference for their mid-career sound.
Very sad to hear about Danny's issues, whatever the cause is. From past interviews (a while ago, really...), I seem to remember he struggled with similar problems before...