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I have no experience in using Yellowfin but Gartner just released their Magic Quadrant for Business Intelligence which features both Tableau and Yellowfin:
Here's a the link to the report where you can read up on the strengths and weaknesses of each:
Of course this is just one report (and I'm biased ), but it's encouraging seeing tableau coming out as an industry leader once again. I always suggest checking out multiple sources to find the tool that works best for you! Hope this was of some help.