Just wanted to add my two cents to this thread.
After excessive indecision and time spent reading up on and comparing devices, I opted for the Noco Boost X GBX45. This is a newer and ~$25 more than the Noco Boost Plus GB40. Sort of the next gen of the same model but a bit more powerful (likely unnecessary) and has an upgraded feature I liked.
The one main reason I got this one rather than the less expensive one is that, rather than charging the device up at a slow rate via micro USB, this can be charged with USB C in much less time if one uses a wall charger of up to 60W. So there is less chance of me plugging it in somewhere and forgetting about it in the 6 hours it would take to charge with micro USB. I think it said 48 minutes with full power USB C to charge it up,
but I cannot vouch for that!
BTW it also has an "override" button. The way I understand it: If the battery is completely dead, many devices will think that you have the red and black hooked up to the wrong terminals, and give you warning beep/light, and will not work. If you are certain about what you are doing, in that instance you can push the override button, and good luck ! ! !
I saw that some people here had recommended Noco so I figured it was OK.
The Audew comes with a much nicer case, the Gooloo wants to charge you another $60 or so for a case. The Noco just comes with a bag.
OK, whatever.
The NexPow looks pretty good, but as with many of these devices, it is really hard to figure out from photos and accompanying documentation what exactly the features are. I think if it has a USB c that says "in/out" then it is capable of being rapidly charged. The Nexpow, I think I would have to do some digging to find out.