I have owned hi end oscilloscopes and usb oscilloscopes. Depends on your needs. For projects with lethal voltages I prefer to work with the real ones but for smaller projects I prefer usb oscilloscopes because they are small and portable. I own PoScopeMega1 by PoLabs which is perfect for my current projects. It's dual channel 12-bit oscilloscope with signal generator and logic analyzer - all in one. There are many other companies that produce similar oscilloscopes but devices are not problems but software. I like software which is straightforward and you can do with one click everything. Polabs has their own PoScope4 software which is really awsome. Simple for usage with different displays (oscilloscope, fft, recorder, logic analyzer) and you can use multiple oscilloscopes in same application. Their user support is very responsive and helpful which means a lot. Bundle package (device + software) costs around 90€.
Check out their web site: https://www.poscope.com/PoScopeMega1bundle
Their blog with useful articles: http://blog.poscope.com/usb-oscilloscope/
p.s. Although it may seems like I am advertising PoScopeMega1 I must emphasize that I am just happy user of their products and that's all. I am not connected with their company in any way.