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That’s a personal preference according to your own needs.
Sorry, there was a problem. Please try again later.Hello! It depends on the features you are interested in. The KX-TGD664 is a newer model on the market. We would need the full model number of the second system you are referring to. If it's the KX-TGF544, please take note that the main difference would be that the KX-TGD664 also has Link2Cell. -M
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