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For me, the best sat nav is the one I have when I need it. With best endeavours, there is bound to be a time when the Tom Tom or equivalent is inadvertently left behind and I get stuck somewhere. So for me, it has to be the proper in-car system.
There's no doubt that even a fairly low spec Tom Tom or similar will generally out-perform the BMW system, but I find the in-car system good enough. Mine is up and running within 25 seconds or so of starting the car (or switching on ignition) and has RTTI available within around 3-4 minutes. The RTTI is not perfect, e.g. indicating queuing traffic that has long-cleared or not most up-to-date with roadworks, but usually does a decent job. The maps are a bit out of date, e.g. my car is a Feb 2012 build and does not have a major road that was opened in late 2010.
Having decided on the in-car system, going for pro nav over business was a no brainer for me. Larger screen, ability to split screen, faster navigation, DVD drive, HDD.
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