I believe the coins to be divided and stored on different wallets. In my opinion, anything that is convenient puts us, our data, coins in danger. So try to put to store coin on official wallets, if such there are. In addition, if you have, for example, 20 ETH, I advise you to also separate them and store them at different addresses.
Yes, it can be safer. Although the danger that your wallet can be hacked is not as great as some people think, it exists. Additionally, try to work with many altcoins, tokens from top-20 and the new ones as well.