What are the differences?
Hi addadadad, first a word of warning: right now the web wallet is NOT valid for the Airdrop. If you want to use it for personal use that's fine and it works like a charm, but as it doesn't offer CoinControl yet it would mess your balance when making the required 0.001 TX to validate the address. Apart from that, the main difference is that the web wallet makes easier to get started and it's really convenient, although you have to trust that nobody is making a "backup" of your private key; while with the Desktop wallet you're in full control of your private key, and also can stake your coins to gain something more through PoS
Hope you get the picture, don't hesitate to ask if you've got further doubts !!