I always viewed each subclass of Lizardmen in their own sort of views of different races.
I suppose the slann are the least emotional, and therefor mostly review the different races according to their uses towards the Great Plan.
The Saurus distrust most races, having been in combat with nearly every race imaginable except some giant insectoid planet-destroyers from the future. They would tend to go for broke, and just eliminate any race that poses a liability towards the plan.
The Skinks are most agile of mind, swift thinkers and workers, but cowardly also(to lizardmen standards) I think when neccesary skinks would negociate some form of alliance with the forces of order, so long as they percieve no threat from them (which makes dwarves a real no-no... y'know, mountain moving and stuff)
As for the skink priests, they would harbour the same views as the Slann, but too a lesser extent.
I always viewed chameleon skinks, and Southlands skinks(think back to the previous lizardmen book) to be more predatory in nature, and territorial to a fault. They'd probably think twice about leaving their territory and wound hunt down any mortal stupid enough to enter.
I think the views of Lizardmen are fairly complicated; they seem to be quite enigmatic and fearsome, even when bared of their weapons.