The video I just made is at
https://youtu.be/8xvTIq_Nohw and is called Comparing three SDRs - First Steps
It will be available about 6:30 pm Houston time on 18 Sep 2019.
I compare two RTL_SDR Blog V3s and then one of them to a NooElec E4000.
I am using SDR# - https://airspy.com/download/
and RTL_Power - http://kmkeen.com/rtl-power/
Not in this video, I also looked at the AirSpy Discovery at https://airspy.com/airspy-hf-discovery/ and do not recommend it. It might be technically a good device, but software support is mostly not there. You can look at pretty pictures with SDR#, but it won't work with RTL_Power. Nor will it work with AirSpy's own SpectrumSpy. My impression is the RTL_SDR V3 is more stable and reliable at this point.
I am just getting started, am hampered by poor documentation, and partly because I have never listened to the radio the way the "professionals" have. I am a mathematical statistician. So I am more interested in the numbers than the pictures. I like a good visualization as much as the next guy, but if it is just "eye candy" - pictures with no access to the complete data, it is useless to me.