As Ross said, it's open, but using both is fine. You can use the bindings from MvvmCross on iOS and still maintain your MvvmLight functions.
Edit: the question of which is better is open, but I donβt think the question should be closed, because it is very possible to use MvvmLight and MvvmCross (bindings) together.
This repo has an example of using MvvmCross bindings. There is information about this in this video.
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