My experience is limited to the US. I'll admit my frailty up front, I dive single tanks with a 19 cu/ft pony. In Key Largo, I've dived the Duane 17 times and love the stairways between decks and the incredible coverage of all surfaces. I've dived the Spiegel Grove 18 times, 13 upright. The swim throughs on the main deck with communication to the well deck are incredible. In San Diego, my 8dives on the Yukon have been particularuly memomorable though my single dive on the Hogan was my most memorble, especially due to the Wolf Eels. My 5 dives on the Sea Tiger in Oahu were incredible, the engine room is fantastic.
Good diving, Craig