I'm installing Ubuntu right now and seems much more aesthetic than i thought open source software should look like. It looks like it has an apps store as well. Which implies to me that the developers have some kind of monetary incentive. Or is it much to do with nothing? Or am i just paranoid? What do you think of Ubuntu?
The technically correct answer to your question is No, it isn't the most secure. The practical answer however is Yes, it's good enough. If you're only keeping your "spending money" in a local wallet, don't run as the root user and implement some basic security practices, you should be fine.