As I see it, in your question, you are mixing some varies fields.
I’m not sure if you wish to know the most profitable way of trading coins,
or the safest way of trading coins.
Another question you are asking is if you should continue investing Crypto world Via ETH/$.
As everything in life, each side always has its own pros and cons.
Investing using FIAT may tunnel to Coinbase, Kraken Cex and etc, allowing you to invest a coin from a pool of around ± 50 different Cryptocurrencies I believe.
When you ask about safest - what do you mean by that?
- safest coin in a way so the whole team would not run away?
- safest coin in a way of “sure rising value”
- safest coin in its protocol code against cyber attacks?
- safest plattform to trade?
Final point needs to be issued are our beautiful ICO platforms, allowing you to go so deep in our Crypto-World.
Using ETH / BTC will allow u to participate them, increasing your verity of choices, allowing you to maximize the odds of finding “your right one”.
In terms of security, after all its not only about the coin u have invested with,
but what Wallet you used, what platform, what team, what Protocol and many many others that should all be taken thought of.
Long story short -
For my opinion it is well to invest carefully using ETH with MEW (MyEtherWallet) for ICO’s, (or any ERC20 supporting wallets, like Exodus),
and Bitrexx is an amazingly simple platform for trading coins.
Any way, at the moment get some ETH.
Casper is doing well ^^
Hope could help a bit,