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With the two choices you have your options are a little limited. If you see the power supply and radio as being fixed and not moving then a 14 or 16 gauge wire between the two terminals and your radio fed through the holes will be sufficient. The preferred wire would be stranded with a rubber or THNN plastic covering as insulation. If you think you will be moving the radio and/or the power supply around then use the banana plugs with a rubber or silicon insulated wire of the same gauge.

True THAT! The last true natural disaster I worked as a volunteer communicator was the May 6th, 2015 tornado that went through Roseland Nebraska. I was taking an alternate route on my way home to avoid the storm, talking to friends on the 2 Meter repeater in Hastings when I got a call (on the 2 Meter repeater) from the Adams County EOC, asking if I was in the area of Roseland. I was about 10 miles east of there, and could see the problem. They had ZERO information on the situation, and were unable to contact anyone in the area. At their request, I turned west, and proceeded toward Roseland. When I got there, the damage was done. The storm was already passed. No longer able to reach the Hastings repeater, I checked into the Heartwell NE repeater, which is RF linked into the Campbell NE UHF hub, which is RF linked into the Hastings Repeater. I was the first to call in to Adams County EOC to have them send first responders. I found no injured persons. I found property damage to the extreme. On my reports, they called in trucks, tractors, saws, manpower, the natural gas and electric power companies.... No one really needed ambulances, so only one or two had to be sent out just in case. That saved hours of time for emergency responders. Why did ham radio help here? ...because the tornado ripped out the main fiber optic box on the south end of town, thus there was NO internet. NO telephone. NO cable television, NO emergency communications to the dispatch office. NO police radios. NO fire department radios. NO service to the local cellular phone tower. The place was an island of zero communications due to one point of failure. But that has nothing to do with GMRS. I was asked to help if I could, and I did. It DOES go to show that any installed communications structure that relies on land based internet, or even cellular data, is prone to failure at the time it will be most needed.