it seems to me that if you are investing for the long term you want to use the wallet type, the Ledger nano , but if it's constantly trading course exchange

At first,I like storing my coins in my wallet,because it's safer!
Later,I realize I need more trades to make profits,so I transfer
my coins to the exchange.
And I know when my coins in the exchanges,I could be more
focusing on the trade.
In fact,the coins in the exchange are safer than wallets!
The customers have a more probabilities to lose the private key with
using wallets,that's a dangerous action,you will lose your coins entirely!

In the beginning I used exchanges but now I transfered to a personal wallet. Occasionally i use exchanges to purchase cryptos but then I transfer it to my wallet. If anything occures, I can transfer it to any of the exchanges cheaply and in a fast manner while if I hold all of my crypto on one exchange and there is high volume I have to wait for hours until the servers become operational again

If you plan to keep your coins, then it is better to keep them on purses. On exchanges in this case, it is better not to store the tokens. The probability of losing them increases. And if you trade, then definitely you need to keep them on stock exchanges.

there is nothing difficult to choose a wallet or exchange.
now it all depends how your goals in the coin.
if you just want to save it in the wallet like MEW.yang most important you have to be careful with phishing sites there.
if I personally never keep a coin in exchanges unless I want to replace it with real money.

The better choice would always be to keep it in the wallet simply because the one who has access to it are the ones who has private key or seed which would be you and anyone you would provide your private key. If you keep it in the exchange then anytime the exchange will shut down, they are taking your coins from you and you can't do anything because you don't have access to it. Yes it would be favorable if you keep it in the exchange so that if there are any trading opportunities then you can quickly trade but the disadvantage is that you don't have the private key so typically it is not your coin.

If you are active traders it's ok to put some of your coins in exchange, but if you are a long-term holder then the wallet is your best choice, but do not put the majority of your coin in exchange, we have seen a lot of complaints on exchange, being hacked or compromise, so play safe wallet is still preferable.

I guess that’s the very right decision. Wallet - for saving coins, exchange for trading, but I also tried aggregator and it is not usual but still it it fast and nice.

Exchange is way too vulnerable to hacking plus your coin activities is pretty much exposed, wallets are safer bet as you can chose which one works for you and encrypt it in your own liking, always stay safe