Better go with 10.4 latest version. Anyway tableau will add all features in latest.
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Short answer: 10.4
So 10.3.4 is what is considered a maintenance release. It fixes some minor things in 10.3 Essentially it is the latest version of 10.3 Anyone using any version of 10.3x can open and work with 10.3.4 On the other hand 10.4 is considered an upgrade. Anyone using Desktop 10.3x will not be able to open workbooks in 10.4x
Since it is best to keep your Server and Desktop versions the same you should go with 10.4 But since 10.5 has been in Beta for awhile you might consider waiting a bit (no telling how long) and upgrading to 10.5, which has some really cool new features (viz in tooltips and saving to previous versions of Tableau).
Thank you very much for the explanation. That answers my question