I have done some reading (here and elsewhere) and have found
What are most FJR folks running and why?
Install location? I have seen some under the passenger seat but it seems to me that you would have to run a lot of wires back to the front. I would like it to be as simple and convenient as possible without excessive amounts of extra wire. It obviously has to be in a reasonably accessible location and well protected from the elements.
Where do you get your power to activate the relay for switched power? Positap or other method of connection? Headlights which would only work after starting the bike or other location (i.e. marker lights) which would work with key on.
Do you have "always live" circuits, "switched circuits" or both?
What version are you using of any of the above brands - there are some options?
Physical size, versatility, robustness, capacity, ease of mounting/installation and (to a lesser extent) price are all to be considered.
P.S. Suggested location for an additional cigarette lighter type of power socket?
Note: If this has been covered in detail before, just point me in the right direction. I did read the FJRTech article.
Edit - Added Fuzeblock to selection.