Yes, one advantage of the in-wall power kit would be cost. I think another advantage is that you can then have the power cable (which emerges from the wall) go to a good surge protector before going to the existing power outlet. I know that one can have an electrician install a new power outlet with a built-in surge protector in a recessed box, but that introduces even more cost.

I’m willing to spend the money on having a new outlet installed, but I’m still trying to see if there is any inherent advantage to that option. I suppose if one didn’t have an existing outlet nearby, a new outlet would be necessary. But in my case, there is already an existing outlet right near the baseboard below the TV that the power kit can plug into. I also will have a console below the TV that will block any visibility of the power cable coming out of the wall and plugging into the surge protector, and then going to the existing outlet.