The verdict: On longevity they're evenly matched (moderate (4-6h) vs moderate (5-7h)) — skin chemistry will decide. They live in the same scent territory — aquatic and citrus against citrus and woody — which is exactly why people cross-shop them.
Giorgio Armani Acqua di Giò (Eau de Toilette, 1996) against Chanel Allure Homme (EDT, 2004): They share a aquatic-citrus backbone, which is why shoppers cross-shop them constantly. Here's the honest, note-by-note breakdown — longevity, sillage, seasons, and who each one is actually for.
Giorgio Armani · Eau de Toilette · 1996 · Men's
Accords: aquatic · citrus · fresh · woody · aromatic · musky
Top: Calabrian Bergamot, Lime, Lemon, Mandarin Orange, Neroli, Jasmine · Heart: Sea Notes (Calone), Jasmine, Peach, Rosemary, Freesia, Hyacinth · Base: White Musk, Patchouli, Cedar, Oakmoss, Amber
Longevity: moderate (4-6h) · Sillage: moderate
Seasons: spring, summer · Best for: everyday, office, date night
Full Giorgio Armani Acqua di Giò breakdown · Check price on Amazon
Chanel · EDT · 2004 · Men's
Accords: citrus · woody · aromatic · fresh · aquatic
Top: Orange, Aldehydes, Sea Notes, Mandarin Orange, Black Pepper · Heart: Cedar, Pepper, Neroli · Base: Tonka Bean, White Musk, Vetiver
Longevity: moderate (5-7h) · Sillage: moderate
Seasons: spring, summer · Best for: everyday, office, date night