Choosing an oscilloscope or other test equipment is more than picking one that has the bandwidth for a particular application especially these days where oscilloscopes can provide more than just traces of signals. They can be programmable. They can analyze signals and then there is the plethora of probes, storage and triggering options available. There are also a lot of vendors and distributors where you can obtain this equipment.
This TechXchange includes articles that examine seletion issues as well as lists of vendors and distributors to consider. Check out the parent TechXchange, Engineer's Guide Oscilloscope Techniques, for articles and videos on the use and operation of oscilloscopes.
Below you will find some videos on things to consider when selecting an oscilloscope.
How to Choose an Oscilloscope
Tektronix is a well known OEM and this is a short overview of things to consider when choosing an oscilloscope.
12 Tips on How to Select Your Next Oscilloscope
Keysight is another well known OEM in this space. This is a longer video that delves into oscilloscope details that engineers should consider when looking for a new scope.