The centralization of BTC will lead to its downfall. Eth is possibly a lot of smoke and mirrors but it is a fun ride just now and it has potential to go massive before common sense prevails. It does have potential, at least if the hype is believed. But it can also go down the dead end route that BTC has gone.
What makes ETH possibly smoke and mirrors and how has bitcoin gone down a dead end route? I am truthfully curious why you say those things. I know little to nothing about ETH and from what I've seen with bitcoin, it is doing quite well and has been for a long time.
BTC is in the hands of a few mining companies in China - they rule the roost. It is far too expensive for ordinary people to afford the machinery and the electricity to mine BTC. They have the power to change supply to suit themselves and that will affect the price too. BTC has done very well but it cannot continue to do so - there are too many alternatives and one of them will get it right. I am not sure if it will ETH - there is far too much hype on it but there may be a basis for some of the hype. That is why I have some - I also like Rimbit - a pre-mined coin that avoids the pitfalls that BTC cannot - check them out on Rimbit.com and say Bob sent you
BTC is not finished yet - there is still money to be made in it but I am certainly not putting my pension into it.