i dont think you will notice any aesthetic difference to medpor..... I have medpor in my jaw right now. It feels like rock.
titanium is an ideally biocompatible material IMO but again, the things i question are: 1. titanium used as large augmentation doesn't really have an established track record... medpor does 2. is it "true" titanium or an alloy mixture? this is important to establish as having other metals mixed in really defeats the appeal of titanium (non-ferrous, no allergic reactions, no breakdown by body)