what are the differences?
Canon websitelets you run a product comparitor. Suggestion might be to give it a try.
Both appear to be PAL though there appears to be a NTSC version of the 200 as well. 306 allows 32Gb SDHC. 200 allows 16Gb SDHC and looks likePAL versionmight have a video light. Lots of similarities some differences. Looks like it would depend on usage what your choice might be.