In Spain, this is always a big debate! Based on my experience with my VW Golf and Peugeot RT4, here is my take:

HERE Maps (formerly Navteq): These are my top choice for iGO Primo. In Spain, HERE usually has better coverage for attributes like truck navigation, speed limits, and precise house numbers in newer urban developments. The 'FSP' (smart routing) and 'HNR' files seem to work more accurately with HERE data here.

TomTom Maps (formerly TeleAtlas): These are also very good, especially for rural areas and mountain roads in northern Spain. Some users prefer their routing algorithms for long-distance highway travel, but I find their POI database slightly less updated than HERE's in my specific region.

My setup: I personally use HERE 2024 Q2/Q4 maps. They integrate perfectly with iGO Primo on WinCE 6.0, and the 'DA' (Driver Alerts) files for Spain are very reliable regarding curves and school zones.