Idk...past prime Holyfield went the distance with Lewis twice and was competitive, especially in fight 2. I think Lewis was overall better than Wlad. Can't say if Holyfield would win for sure, but it's competitive.
Lewis at his best was arguably better than Wlad but on most days Wlad was better than Lewis simply due to his absolute consistency in the ring. Lewis could come in flat or disinterested and stink the joint out sometimes.