By using wETH, you would be able to engage on different DeFi platforms and protocols that run on the Ethereum blockchain. If you want to handle ETH, you would rather use wETH, which can easily be converted to ETH at any moment. Some exchanges are even offering users the possibility to exchange wETH for ETH, in this way, you do not need to engage with smart contracts. When you transform your Ether into wETH, you do it in order to keep some funds available in a token that you can use to quickly exchange for other tokens within a DEX. Normally when you only have Ether, it is in your wallet. If you want to buy a token in a decentralized exchange, you must first transform said Ether into a token and from there participate in the commercialization of the token you want. This process adds more complexity to the process. By transforming your Ether into wETH, you ensure that your trader it will be much simpler and safer.