Type Rating is about 70-80,000 usd for either, someone can please post more specific info regarding cost if this is inaccurate.
Looking at the very broad picture the 139 seems to be used mainly offshore with the exception of some SAR or Medevac ops.
The Mi17 rating may take you into places that are a bit more interesting I'm guessing, I don't think they fly offshore much these days.
Thanks for the replies, please keep them coming.