Thanks Leeshor. I should have posted more about my thoughts as a user. I have an Air 1 currently, which I plan to give to my wife( she dropped hers). I do my desk work on a PC ( Win7) . My 14inch screen notebook just died. So, I guess I was attracted ( like most men) to the Pro 4's larger higher resolution screen, (12.8 " )as compared with the Surface 3 screen (10.8") . Plus it has LTE. there are many times I regret not spending the extra bucks, so that my Air was cellular friendly.Welcome aboard Sean.
Liam's last post was over a year ago so you may not get much of a response from him. Personally I favor the SP4 but you probably could do all of what you need as you stated on the Surface 3 without problems.