What is better? What is good for the other, it does not have to be for you.
iGO is one of very best navigation software for cars. Proven has one of the best routing algorithms.
Of course, navigation is as good as its good maps. First, get information, by local forums, for your part of the world, which publisher has the best maps/software.
If you want to experiment, you have a variety of editions on the forum and choose. Look in dedicated sections.
From general experience, the only one who can compete with iGO, is TomTom. Again, there are dedicated forum sections...
And, warm recommendation, do not rely solely on navigation, use your eyes and brain.
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