I personally think Black Sabbath were closer to progressive rock of the 70's.
1. Black Sabbath - title track, N.I.B., Sleeping Village, The Warning
2. Paranoid - War Pigs, Planet Caravan, Hand Of Doom
3. Master Of Reality - After Forever, Orchid, Solitude, Into The Void
4. Vol.4 - Changes, Laguna Sunrise, Under The Sun
5. Sabbath Bloody Sabbath - everything except Sabra Cadabra
6. Sabotage - Sympton Of The Universe, The Writ and this nice instrumental with choir (can't remember the name)
Well, these are just songs. But compared to LZ they also cared more for album's coherence. Their early albums are very tight pieces of music, not just collections of songs (like LZ's albums except "IV").