It's relative. TRON may be cheaper than EOS, but that's probably because its total supply is somewhat higher than EOS. Not to mention, it's not as widely used and demanded across the market than EOS itself. In terms of technicalities, they're rather the same (although EOS has better features and flexibility). As both platforms use DPoS for consensus, transactions are blazing fast without fees making them extremely ideal for smart contracts.

While TRON and EOS are still new to the crypto space, they have gone quite far in terms of development and innovation. Compared with Ethereum, they are much more scalable than its competitor. However, they're not as decentralized as Ethereum which explains why they're highly scalable. Despite this, it's often good to invest into both TRX and EOS for the long term due as they will become adopted by businesses, companies, and individuals alike.

Nonetheless, TRON has an advantage over EOS where BitTorrent is integrated with the Blockchain. This could bring a lot of exposure to TRX relative to other cryptocurrencies on the market today. Whenever this is going to be a success is yet to be seen. Just my thoughts