I think he has a good future in the sport but I don't believe he will ever have a chance to win Mr. O. Think about all the greats who have never won a title! Just my opinion.
Speculations are fun, and all you can go on at this point, as he's only been competing for a few years.
Both of them have a good 10 years or more before they're even at their peaks. So, in the end it will be who can stay motivated to pursue bodybuilding the longest.
They both have a ton of potential. It is exciting to see young guys doing well in bodybuilding again. For most of bodybuilding's history, there have been plenty of young guys coming up and making big entrances. That hasn't happened for the better part of a decade until Phil Heath came along.
Now there are more than a few young guys who are climbing the ranks quickly. It makes things more exciting, at least in my opinion.