RE Zombies: Basically your standard Shamblers, except that when being 'killed' without being decapitated or immolated they will shortly return to 'life', stronger, faster, more agressive and with fresh claws. This may disqualify them. If it does not, it may give them an upper hand.
Solanium Zombies: The Zombie Survival Guide zombies. Basically your normal dumb Romero Shambler, including the general immunity to anything but a headshot. Freeze up at subzero temperatures, going dormant until thawed. Flesh is extremely toxic to living beings, likely causing trouble for the Rage Zombies and Infected.
Dead Rising Zombies: Shamblers. No special resistance to damage (in fact far less so than humans), seem to be physically weaker than a human being. Display an obvious horde mentality, being almost never seen in groups of less than ten. At night time, they become more aggressive and tougher. Seem to have some horribly rudimentary ability to use weapons.
Of these, I'll go for the Romero zombies. Rudimentary intelligence, human-equivalent strenth and a slight bit of intelligence beats any of the above. Solanium zombies take anything that has 'infected'-style still alive zombies right out of the running.