I suppose you mean "I will yearn for your presence".
"I will miss you" is in general better.
However, you can use the continuous form informally if you specify what exactly will be happening as you miss this person:
I will be missing you while you are away.
But even here the simple form (I will miss you while you are away) is definitely the more polished, literary one: essentially because to miss, like to live, is a continuous process in itself.
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