Transferring cryptoassets to the eToro wallet will allow you to use it for making payments or transferring it to another crypto wallet. Basically it's taking the next step in making your crypto much more usable for you. You should only keep it on the eToro trading platform if you're planning to invest. If you really want to convert it to another crypto or real money so that you can buy or pay for something, then putting it on the wallet is the best option. As for the cons, the minimum transfer to the wallet is not that low. For example, if you want to transfer your ETH, the minimum has to be 0.107588 ETH. That's around $370 as of this writing.