I don't know if he is still here definitely sounds better. Plus, this version seems more natural, since in speech you typically say he's instead of he is - and when you say the first version, you can say: I don't know if he's still here, whereas if you try to say the second one, you can't connect he and is.
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piotrekpodgajnyI don't know if he is still here definitely sounds better. Plus, this version seems more natural, since in speech you typically say he's instead of he is - and when you say the first version, you can say: I don't know if he's still here, whereas if you try to say the second one, you can't connect he and is.Excellent point! Thanks. And welcome