I have one of the older Bitscope, I am not satisfied with the frame rate when updating. The new ones is much faster and have ethernet / USB.
I depends upon the budget, last time I checked the PICO were more expencive.
It also depends if you like to buy a finished product or build something yourself.
If you have money I would buy a external one.
I am using a SDS 200 USB oscilloscope up to
2 yers and I am greatly satisfacted with it, though
having under my hunds such an super as TDS2024.
Look the www.softdsp.com site.
Varuzhan