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OCN 5 has more features. However, it does seem more buggy. Sometimes, it'll run into memory allocation error and sometimes, it can not identify the BT GPS. A simple reset will correct the problem but it's a hassle.
iGuidance is easier to use and more stable. I like iGidance's voice a lot better than OCN's voice. However, it does not have seamless map and not as feature rich as OCN.
It will be hard to pick if both were the same price. But at $50 difference, I would definitely recommend iGuidance.
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