Is it necessary to have both a digital and analog oscilloscope?

CrossRoads:
With so much serial data on Arduino, having an SPI/Serial/I2C monitor and logic analyzer can be handier than a scope. There are times when a scope comes in handy, such as checking integrity of signals, see if one is being overloaded and dragged down or something.

Agreed, I use the scope mostly for checking DC power supplies noise and other analog low level stuff and some ham radio RF stuff. Still very useful to see those nasty invisible electrons.

Lefty