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Head units today - decisions usually boil down to personal user preferences. One can pair 2 phones, one has great GPS, one has X feature, the other has a Y feature. As others have stated, you need to compare the features list side by side and decide which ones are important to you personally.
Warranties are overrated in car audio, especially in non-speaker applications. Purchase using AMEX (or other CC) that offers performance guarantees and double OEM warranty after finding a good vendor that backs their merchandise and save a mountain of cash.
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