Ken @ Vernon, I still use an HP Mini netbook with single atom core cpu. I like to take it on trips because it is light, does the job and is so old that i would not care if it was stolen. I put in an extra stick of ram which helped marginally with speed. The best upgrade was a cheap SSD drive which made it substantially faster. My previous hard drive in the HP had crashed so i was forced to get the ssd for the netbook. The current prices for ssd are quite affordable, so i just cloned and swapped in an ssd into my ASUS work laptop. It is much faster now. And it has improved the battery life.
For OP, i can attest to quality of ASUS ultrabooks. The form factor is very similar to Macbook Air. If you get any Windows 10 notebook, i would recommend you find one with an SSD already included. The speed and battery life is worth it. ASUS, HP, Acer, Dell are all good, imo. You can find models with the same specs/performance. Then is just comes to price and looks.
My son just got a Surface Pro 4 and he likes it a lot. He can use it to study and take notes using the surface pen, He bought it directly from the Microsoft Store during Black Friday and Cyber Monday. Prices are way back up now. Personally, for the price, i would have preferred a Macbook Air over the SP4. I would expect price drop after Christmas and in the new year. The Surface Pro 5 will be coming out early next year so i would expect the 4 to be discounted then.
We also have an old ipad 3. I found getting a logitech keyboard made it a more productive work device. However, i do not kow anything about website editing on either platform. I still prefer netbook over ipad for travelling because it take a lot of photos and i can transfer photos to the netbook much more easily for backup and editing. Also, it is less likely to be stolen.