ETH - more popular and longer on the market. TRX has more signs of a ponzi, some people even call it a scam due to its semi-centralized structure. ETH on the other hand is decentralized. I don't trust centralized coins and not going to touch semi-centralized either.
While Vitalik is a weird genius, Justin is a PR guy. He throws money around and thinks that if he spends enough money on ads they will bring back even more in revenue. I'd be afraid that one day he says fuck it and bails with all the profits.
Yeah it also scares me sometime that Justin would get bored and just give up on his project so many things have happened and nothing has change on TRX I didn't even see it go up into $0.41 for a long time now.
But as you can see ETH has always been a wild one always have a huge move but I wouldn't deny that ETH also have a huge dump but it always have it's way to climb up.