Digital oscilloscope vs pc usb oscilloscope

Is there a functional difference between a cheap digital oscilloscope and a usb oscilloscope? I will be needing one, and i noticed on ebay and amazon that the usb ones tend to be cheaper. I'd like some input on this so i know what todo. I am going to start online collage here soon for electronics engineering soon and will probly be needing one.

~Owner, Designer & Builder Killer K.A.R.R.
~Starfleet Captain Joe R.
Current Commission: USS-Titanic Registry Number NCC-1513
Launched: Star Date 48509.9 April 10th, 2385
Galaxy Class, Titanic Sub-Class Starship Max Warp: 15.96


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