Out of curiosity i just looked up the stingray scope specs, from this page, im assuming you have this one.
http://www.easysync-ltd.com/product/520/ds1m12.htmlFeatures:
· Combined Oscilloscope, Data Logger, Signal Generator, Spectrum Analyzer,
Voltage and Frequency Meter functions
· 12 Bit ADC Resolution
· Simultaneous sampling on both channels.
· 32k Byte Waveform buffer
· Oscilloscope Mode - 20M S/s sampling rate ( repetitive ) 1M S/s native
· DataLogger Mode - up to 50k S/s 12-bit data streaming simultaneously on both
channels
· Maximum input voltage +/- 50V
· AC / DC Coupling
· Edge, min/max, pulse width and delayed trigger modes
· Analog Bandwidth 250KHz
· Inbuilt 10-bit waveform generator with +/- 3.5v output range and 1k buffer.
· Hardware upgradeable over USB
· Self Powered USB Interface ( 250mA )
· EasyScope II ( Windows ) software (see downloads)
· EasyLogger ( Windows ) software (see downloads)
· Interface DLL's and code samples for 3rd party developers included
· Instrument carrying bag included
· Attractive enclosure with rubberized inmoulds
· Dimensions W: 116mm x H: 30mm x D: 100mm
the key point i see here is "Analog Bandwidth 250KHz"
With this you are not going to see any high frequency spikes and it will make your PSU look great! with the Rigol you will see a lot more noise.
250KHz verses 100MHz basically you have a much better pair of eyes and you can now see the detail, the view is no longer so blurred.