Tron and eos are the main competitors for ethereum.
The problem is that you may create a token for that plataforms and the plataform suddenly may be gone. Ethereum is far more stable in my opinion
Also, ethereum costs are very low.
No transaction cost will be a problem , as the plataform would be vulnerable to ddos attacks. Iota is trying something like that but there is no tokenization
don' forget about some new coin launched few month ago,that a BinanceCoin with new technology they bring, fast transaction in just 1 second as binanc claimed, and low fee transaction by using binancechain, many project based on Ethereum are now migrate using binancechain