I voted for Still Life, with Orchid coming a close second.
I don't really like the Morningrise tone (didn't they use Metalzones for it? ), although the album is great, the production kinda pisses me off. And when I put on Orchid afterwards, I always think: Now that's what it should sound like...
MAYH is a little to muddy for me on the distorted parts, but I like the tone.
BWP sounds a little to... well... perfect for me. It sounds great and all, but not really interesting.
Deliverance: On first listen I was like: Argh, what's that?
But I quickly grew to like the tone, it's actually quite interesting (not like BWP) and fits the album.
But Still Life IMO is near perfect, I totally love the tone.