I haven't owned both so can't give an accurate comparison. I have a Russell now and love it, the best addition to the bike by far. I've thought about trying an Adcox if I got another bike, but after all the experience I've had with bad aftermarket seats and seat accessories, it doesn't make sense to screw around with an unknown when I know the Russell really works.
2009 Wee Strom ABS (current)
1987 Harley Low Rider Sport (current - with 205K miles)
2009 Aprilia Mana 850, 2006 SV650, 1984 Yamaha Virago 1000 (all sold)
Silver Strom Club Member #11
Wee Farkles: Russell Day Long Seat, Madstad with Moose Adventure Shield +4'', SWMotech Centerstand, 1'' up & back bar risers, Givi XS308 Tankbag, Aprilia mirrors, Framesliders, Fenda Extenda, Elka Shock.