Are you planning on purchasing this for when you do get a replacement, or are you looking for a battery pack you can use with your 2010 MacBook Pro?
For me, absolutely USB-C. With a 12.9” iPad Pro, the charge time over usb-c is significantly faster. I consider my big iPad a usb-c device. Plus my go pro is also usb c.
GoPro Camera. It's a sports action camera. Mine is based on USB-C.What is go pro?
Since I just bought a special cable, I didn't need a USB-C port on my battery.