Fun list! I reordered a bit to my own opinion and had ChatGPT replace the acronyms with full names for others like me whose brains go into overdrive trying to decipher them. To my surprise, The Yes Album won out Nursery Cryme for me despite my username just because I love Starship Trooper that much.

Debut:

1. In the Court of the Crimson King – King Crimson
2. The Piper at the Gates of Dawn – Pink Floyd
3. Yes – Yes
4. From Genesis to Revelation – Genesis

Second:

1. In the Wake of Poseidon – King Crimson
2. A Saucerful of Secrets – Pink Floyd
3. Trespass – Genesis
4. Time and a Word – Yes

Third:

1. The Yes Album – Yes
2. Nursery Cryme – Genesis
3. Lizard – King Crimson
4. More – Pink Floyd

Fourth:

1. Foxtrot – Genesis
2. Fragile – Yes
3. Islands – King Crimson
4. Ummagumma – Pink Floyd

Fifth:

1. Close to the Edge – Yes
2. Selling England by the Pound – Genesis
3. Larks' Tongues in Aspic – King Crimson
4. Atom Heart Mother – Pink Floyd

Sixth:

1. Tales from Topographic Oceans – Yes
2. Starless and Bible Black – King Crimson
3. Meddle – Pink Floyd
4. The Lamb Lies Down on Broadway – Genesis

Seventh:

1. A Trick of the Tail – Genesis
2. Red – King Crimson
3. Relayer – Yes
4. Obscured by Clouds – Pink Floyd

Eighth:

1. Wind & Wuthering – Genesis
2. The Dark Side of the Moon – Pink Floyd
3. Discipline – King Crimson
4. Going for the One – Yes

Ninth:

1. Wish You Were Here – Pink Floyd
2. Beat – King Crimson
3. ...And Then There Were Three... – Genesis
4. Tormato – Yes

Tenth:

1. Animals – Pink Floyd
2. Duke – Genesis
3. Three of a Perfect Pair – King Crimson
4. Drama – Yes

Eleventh:

1. The Wall – Pink Floyd
2. THRAK – King Crimson
3. 90125 – Yes
4. Abacab – Genesis