I am not an expert. But no more safer than keeping your coins inside your wallet. I am not saying it is not hackable. It is if they got your private key and password. Putting your coins in an exchange is risky. Risky in a way that an exchange has a large chance of being hack than your wallet. So limit what you are going to put in the exchange.

Thats completely my view, at the moment it is better to use wallets, hope Binance is starting their DEX soon.
My favourite decentraliced exchange right now is Waves.
I expect a lot from Waves this year, they are going to be big!

Better a purse for each, in this case, the security will be slightly higher. If they steal, at least not all at the same time.

If you plan to hold the token for a long long time you need to put it on a wallet, you don't need many wallets for each token as you can save it in just one if they are all erc20 or make a NEO if the token is on NEP5.
Why do you need to keep the token in a wallet and not in an exchanger? you might just leave your token for a year or longer and some exchange removes some token.

some of my coins put on the exchange and some of the others I put in the wallet. my reason is because the exchange sometimes closes. and in the wallet sometimes there are hackers who want to steal my coins. when the exchange is closed maih there is the rest of the coin in the wallet and when the coin is missing the wallet there is still a coin on the exchange. it's my strategy to keep the coins I have.

Don't ever hold much tokens on exchanges, we don't have decentralized exchanges now, so we can't trust them.

100% wallet. You have the private key and you are the only one that sends money out. With exchanges, you are kinda voulnerable.

It can be explained in two scenario.
1.If wish to buy from exchange and gonna day to day trading you can put your investment on exchange
2.If you wish to hold your investment waiting for higher return then you can put it into your wallet

I am doing day to day trading through polionex,for last two years and everything is going smooth,i have put multiple keys for securing my BTC,also i have put some portion of my trading in my etherum wallet offline.

Yup, you are correct. I am trying to avoid exchanges at all since that time they started to get hacked or banned. I was looking for some sort of api for conducting exchanges if needed. I came across coinmonkey.io- that’s exchanger which takes rates from major exchanges and you can proceed transaction with any exchange, so they take risks of exhange to be banned or hacked.