I have a DR14 and think it is an excellent guitar, I love it. I've never heard of a OD-3. I went to the Tacoma site and couldn't find one. It could be one of their inexpensive overseas imports which are not the same quality as the ones made in Tacoma.
Link to Tacoma website-
Did a google on the od-3, it is an Olympia which is Tacomas imported brand. They are inexpensively priced and inexpensively made IMO.
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