Well if you're planning to hold for a long time, might as well stick to the old reliables like ethereum.
I actually don't recommend anyone to hold any altcoins for the absolute long term since they haven't proven to be a dominant force within their own industry field. Ethereum hasn't had any serious competition yet to test its solidity, which is why I'm looking forward to how EOS will develop itself from here. I strongly believe that EOS has the potential to overtake Ethereum in the forthcoming years, especially if they get everything working.
Another important factor is that EOS holds like 5% of all circulating Ethers which they can and likely will use to close the gap even further. If on top of that an exchange as Coinbase decides to add EOS where it will gain even more exposure, Ethereum will be pushed down even further. I however don't know how long it will take since EOS might actually be a security. Time will tell.
Same as like here, but I hold altcoins for long-term aside from Ethereum I also hold EOS as of now in my portfolio. I've seen the good technology on this coin and probably it will profitable soon like what Ethereum did last year. Yes, in holding I always prefer into fiat to know how much I've to earn on my holding crypto.