I will second Surveillance Lounge, but add that I think it is the best gateway to NWW material. If you don't like that one, you won't likely get into too much else.
Space Music is highly enjoyable for me. It is ambient music without the beard-scratching, sound for sound's sake, but with a vague sense of beauty (and space). Plus I am a sucker for those hardbound LP jackets.
Speaking of.... The Musty Odor of Pierced Rectums is also like that, and the collage art is great. On brown vinyl. The material is very minimal, vocal musique concret maybe? Little tidbits. I enjoy it.
There is also "She and Me Fall Together in Free Death". That one has some krautrock elements and a particularly dirgey cover of "Black Is The Color of my True Love's Hair", and otherwise excellent ambient sounds.
There are plenty of albums I think are great by them/him, but people don't talk much about Alice The Goon.
There is a ten minute long loop of lounge music with synth skronk over the top and it's absolutely infectious to me. Plus, again, very good ambient music, but that's not a gateway, that's for going deeper.
As for the collaborations with Graham Bowers, I don't think it's bad, what I've heard on Spotify, but it just sort of felt like dialing it in.
But of the most popular albums of NWW, I'd say I prefer Thunder Perfect Mind. It features David Tibet and members of COIL, and Tibet isn't too intrusive, or vocal. Whatever his input, it seems to be sonic, and it's interesting (preferable to these ears, I have to admit). Great odd, surrealistic soundtrack/soundscape material.
I frankly haven't heard a NWW album that I thought was bad/forgettable/not worth returning to, but the closest one to it would be "Gas Huffin' Blues". It is an attempt at relatively straight lounge/exotica vibes, with varying degrees of success. When it is successful, I enjoy it, but that is admittedly about half the time, maybe. I much prefer to own the 12" single that came with it, not remembering the name of it right now, but it has a remix on it that is well worth the admission, and to me is important in the NWW cannon.