You're absolutely right: an ADC will have better overall panel quality in every circumstance always (yeah, THAT'S not evangelism...🙄). If he's a gamer, though, I'd say the Soyo for response time and... um... speakers. 😛
Again,
20" ACD: Professional work, anything truly important
24" Soyo: Gaming, light stuff, realty
Realty was one of my points, and some people take pride in their "souped-up" 1080p's. 🙄 It's funny; dcp063 hasn't even posted again and we're telling him what he does for a living. Yawp. Bygones are bygones...