I've recently acquired a used Surface Pro 5 with Cellular connectivity as a replacement for my old iPad (many apps don't work yet on the newer Surface Pro X, the successor with Cellular connectivity to Surface Pro 5). I take it with me everywhere nowadays and I'm very happy with it.

I agree that Tablet Mode in Windows isn't as good as iOS on iPad. On the other hand, I just want to carry with me one mobile computer/tablet, not two.