Its actually depends on the kind of thoughts you have towards those coins. As earlier indicated by some contributors before me, if you involve yourself  more in trading, especially day trading, l think you leaving it on the exchange is kinda good thou this at your risk, but its goona make trading easier. If your plan is to hold for long term investments, I think securing your coins in your wallet is best. Its more safer from hackers than it being on the exchange, thou wallet is not 100% safe too.

if do you want to save your btc or altcoins for the long time, is it better to store in the wallet
and do not using on exchange to store your bitcoin for the long time. it's very risky.

Of course a purse. Neither one exchange can give you confidence in the safety of your funds. It is better to choose hardware wallets. I use the wallet Ledger Nano S. While I'm happy with everything.

each individual has their own decision whether to save in their wallet or send it to the place of exchange. If you predict the coin will have a high investment value should still keep it in the wallet and monitor developments, while felt not have a low investment value should immediately sell it. Saving a few coins on the spot is ineffective in addition to having issued a fee for the transfer, fixing the price we want will take a long time.

I prefered wallet. Because i use for now myeherwallet compatible in ERC20 . All tokens are compatible in erc20 i can recieve.

Should choose individual purses. to secure your token. Exchange can be hacked at any time and really dangerous

Ofcourse it is safe to store coins to a walllet than to exchange sites because wallets are more secured than exchange sitess. because there are cases that exchange sites are getting hacked and compromised that may result to the loss of many tokens. This is why it is better to use wallets

It is safer to store your crypto coins in wallets than exchanges as there are more chances of loosing your crypto coins if you store your coins in the online exchanges as exchanges have your private key and hackers will be able to hack when storing on exchanges as it is stored online so it is better to store crypto coins in wallets, there are different kinds of wallets available in the crypto market so you need to choose the best wallet to store your crypto coins, USB wallets like Trezor and paper wallets are safer as your private key will be safe in the users hands.

 Wallets guarantee safety to your coins more than exchange does, its not to say that exchange is unsafe,but they are prone to hacks, as compared to wallets where the safety of your coins is entirely dependent on you