If you are willing to hold it for a long time, then I think ADA may be a better choice.
Because EOS faces the centralization problem, ADA is still decentralized.
I totaly agree with you, EOS is too new for long time holding, ADA is much safer
The problem on EOS if we hodl for long term in EOS the inflation 4% yearly and the supply of token EOS will increase, but personallity i am hodling EOS for now 2018 is year of EOS for me, i will buy hodling ada coins at 2019 due to at the end of 2019 will many projects be built on ada platform,