If the user has limited uses for the scope, what a good analysis will show that is most low end scopes are OEMed anyway therefore likely to be nearly identical to one another. (That is, a CM, or contract manufacturer, is making the scope for Tek or NI, etc.)
When approaching the high end, scope manufacturers do begin to differentiate from one another, but it looks like this buyer is not informed enough to enable the SD community to truly assist.
I will add that one more important thing to consider is if there are desires for long term service, because those companies do offer substantial difference in customer service levels.
Final add: Agilent is successor to HP, so will find many of the same features and similar setups in an Agilent scope if you are used to HP.