Tron and Ether both are some good coins to invest in but I don't think Tron will surpass ether any time soon.
Trong surpassing ether would mean Tron would come in second position but that will take a long long time or may be never.
Ether has a greater potential and support than Tron according to me and I can only see more people joining in the Ethereum rally for the upcoming upgrade. Things are in favor for Ether more than Tron in my perspective.