Should I add keywords via AdNabu or Adwords?

You should always add keywords to the AdNabu campaigns via AdNabu itself. We strictly recommend this. The reason behind this is that we create single keyword ad groups for all the keywords (SKAGs). The addition of negative keywords, bids and ads is also taken care by the system. If the keyword is added via Adwords and the structure is not properly maintained, the campaign performance will deteriorate due to internal competition.