An almost impossible task. As someone who only plays full albums and has over 4500 in his collection and can listen to anything from The Carpenters to Slipknot the choices are many.
Growing up with much less availability, all of which I still frequently play, it would have been
Rainbow - Rising
Rush - 2112
Deep Purple - Machine Head
Currently the albums I play the most are
Porcupine Tree - Deadwing (could have been any of that, In Absentia or Fear Of A Blank Planet)
Genesis - Selling England By The Pound ( if pushed probably my all time favourite album, all time track in Firth Of Fifth with Steve Hackett’s solo in the track probably the best section of any track ever.)
Avenged Sevenfold - Nightmare (very apt on an Argyle forum as its a bit of an away game ritual to put this going around Taunton on the way home)
Over the years I have had many current favourites in no particular order
Iron Maiden - Powerslave
Queensryche - Operation Mindcrime
Avantasia - The Scarecrow
Dire Straits - Love Over Gold
Green Day - American Idiot
Within Temptation - The Heart Of Everything
Joe Bonamassa - Dust Bowl
Beth Hart - Bang Bang Boom Boom
Shinedown - Amaryllis
Metallica - Master Of Puppets
Dream Theater - Black Clouds & Silver Linings
Nightwish - Endless Forms Most Beatiful
Could name so many more that I return to play frequently but there’s a few to go on with