Joe it is definitely just a personal choice issue.
Look at the OPs question here, there are no motor loads, there is nothing tricky.
It is just a simple branch circuit.
I feel more comfortable dragging around a $30 almost indestructible meter than having a $300 fragile meter out on the job when it's not needed. (Theft, breakage etc.)
You can save alot of bucks with a couple feet of 1000V flexible test lead, a couple insulated gator clips, a little heat shrink, and a 27k, 2W common resistor.
I don't see that as easer or better than using the right meter for the job at hand.
AS far as GFCI testing the button on the GFCI is more than up to the task.
I am not surprised a guy with a handle of 'testing engineer' would want to use overkill equipment.
You could break out a Yokogawa Scope and find out even more info.
But when all you need to know is;
Is it on?
Is it Off?
Is there continuity between X and Y?
It seems a little over the top.
JMO, Bob