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Some time ago, WebKit(Chrome's rendering engine) rendered some websites worse than Gecko(Firefox's rendering engine). But now WebKit has stabilized more and it's not a comparing matter anymore.
Anyways, if you have Chrome as a primary, have Firefox as a secondary. Or if Firefox is primary, have Chrome or Firefox (If the primary Firefox is actually Aurora) as a backup. They work in unison.
For a web developer, Lunascape might be an awesome tool (Three engines - Chrome's WebKit, Firefox's Gecko and IE-s Trident all in one place for easy switching) but its user interface is sub-par and too crowded with info. Opera is wonderful too for it comes packed with in-place add-ons, for example its source code editing box looks better than all the rest and lets you "apply the changes".