I might prefer ETH, the development of technology within ETH is more pronounced and on the other hand TRON seems less developed, this is seen from the price and use of blockchain technology, people prefer to use ETH rather than TRON.
That's how it should be, the ecosystem on the Ethereum network is bigger than on the Tron network, people only use the tron network for the delivery of Tron (TRX) itself and also USDT, the rest are unmanaged projects. We can see a comparison of DApps running on the two networks from DappRadar at the following link:
[1] Tron Network -
[2] Ethereum Network.
From DappRadar's ranking report, we can see that only SunSwap and JustLend projects have volume above 1M, the rest are below that value. In contrast to Dappradar's report on the Ethereum ecosystem, where the average project has a volume of over 1M, some even reach 1B, namely Uniswap V3.