iPad - better performance, better screen, better battery, better apps, better privacy, better security, better support. You could probably go on and on.
iPad = 98% consumption device for 98% of iPad users. The GO is a joke with its weak CPU. The best laptop replacement is a laptop.
Until the iPad has real mouse support (trackpad or mouse) I will not consider it at all as a replacement.
I have used a 12.9 inch iPad Pro, with Jump Destop, and a Citrix X1 BT mouse to RDP into a Windows computer at work. It works just like a laptop and was a fantastic experience since the iPad is lighter, thinner and has a better battery life than most laptops out there. Too bad the mouse does not work with the iPad in any other way.