This is entirely a subjective decision and you have different opinion than I have. I normally keep a diverse portfolio and the diverse portfolios are way too advantageous and life saving than just investing all the money in a single crypto. I would go with both. But the major part of my portfolio will be composed of ETH. TRON will also be profitable in future but ETH, apart from the future profit, is also the most liquid than TRON and has low risk.