SteveJUAE
macrumors 601
I have an SP3, a new XPS 13, and an rMB. Of these, one will have to go: so, I'm probably selling my SP3. I do need one mobile Windows and one Mac system.
Don't get me wrong - I love the SP3! I just now find that the XPS 13 does most of what it does better, though I will miss the tablet capabilities. My rMB is, however, my most used mobile system. It's plenty fast enough for everything the OP described. That Mobile CPU is way better than critics tout it to be. Battery life is good, and the form factor is amazing. You'll be happy with your rMB.
I'd keep my SP3, if I hadn't gotten the new XPS 13. this little machine is a gem, and it helps that it now shares a USB-C port, with my rMB, as that will be my docking system of choice.
Congrats on the XPS and of course you would have to spend $129 for the new SP4 KB on the SP3 if you were to keep it