Personally I would go and get trigger happy if going to Tanzania. That is the best overall deal for the money. So much of the cost hunting Tanzania is in every thing else other than the trophy fees, which are normally very reasonable in Tanzania... In fact you may never be able to shoot animals of the quality, and especially the quality of the experience, in another local for less. So by all means, best plan to take the trophies offered up during the opportunity.
I actually voted no, but only because even though I was a somewhat experienced hunter when I went on my first trip to Africa, I had never hunted with a larger gun than a 30-06 and had not hunted much in many years prior, having dedicated too much time to building my business. So I wanted to get more experience before hunting DG... But I did take an elephant and buffalo on my second trip 7 months later.
However if you are competent and confident, do it! But I would defer to the advice
@Hank2211 gave on leopard. Why not just take 2 buffalo or add a croc or hippo for the second DG animal?