A. Actually either one will work just fine. Redwood and cedar mulches don't decompose as quickly as pine and they are usually prettier.
Both cedar and redwood have phenols that help the wood resist decay by fungi and bacteria. There doesn't seem to be a problem for bedding plants.
My preference is a variety of mixed woods but we do break down fairly quickly (two to three years) and must be replaced.
Many homeowners like the look of redwood and cedar mulches. They don't break down as fast and so they last longer in the landscape. They may be more expensive initially but they don't need to be replaced as often as pine mulches.