OVERALL: Draw

The 2-disc releases have the most extras for the film itself. Only minor language differences.
The US/UK "Marvel Cinematic Universe: Phase One" have an exclusive bonus disc, but lack the second disc from the 2-disc editions.
The UK "The Infinity Saga Collector's Edition" has three additional bonus discs, but lacks the second disc from the 2-disc editions.

Note that the French edition has also slightly different extras since it loses the "Hall of Armor" interactive feature, "The Onion ‘Wildly Popular Iron Man trailer to be Adapted into Full-Length Film’" clip, some trailers and BD-Live, but offers 8 "Animatics" featurettes and a "Stan Lee Cameo" featurette as an easter egg.

CUTS:

• Blu-ray ALL America- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Marvel Cinematic Universe: Phase One America- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL The Infinity Saga Collector's Edition America- Walt Disney Studios Home Entertainment - No cuts (126:01)
• Blu-ray ALL Ultimate Edition America- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Australia- Paramount Home Entertainment - No cuts (125:59)
• Blu-ray ALL 2-Disc Edition Australia- Paramount Home Entertainment - No cuts (125:59)
• Blu-ray ALL 2-Disc Edition France- M6 Vidéo - No cuts (126:13)
• Blu-ray ALL 2-Disc Edition Holland- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL 2-Disc Edition Hong Kong- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Poland- Imperial CinePix / Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Scandinavia- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL 2-Disc Edition Scandinavia- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Serbia- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL 2-Disc Edition South Korea- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Spain- Sony Pictures Home Entertainment - No cuts (125:59)
• Blu-ray ALL 2 Disc Edition Spain- Sony Pictures Home Entertainment - No cuts (125:59)
• Blu-ray ALL United Kingdom- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL 2-Disc Edition United Kingdom- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL Marvel Cinematic Universe: Phase One United Kingdom- Paramount Home Entertainment - No cuts (126:01)
• Blu-ray ALL The Infinity Saga Collector's Edition United Kingdom- Walt Disney Studios Home Entertainment - No cuts (126:01)
• Blu-ray B Germany- Concorde - No cuts (125:57)

Do you own a release not listed? Then please visit our forums and let us know!

Comparison added by Frank_Vincent on 02/10/08
Comparison last updated by Matthew_B_Harrah on 25/02/23

UPDATE LOG:

14/10/15: Additions of the Australia x2, UK single, Germany, added ASINs, added US runtime.
27/09/27: Added Scandinavia single.
23/04/20: Added Hong Kong, South Korea.
03/10/20: Added Spain x2.
10/08/22; Added US MCU One, US infinity, UK infinity, UK MCU.
25/02/23: Added Poland.