I am not looking for gaming laptop, I want it primary for work, for gaming I have desktop

Until now I had only 17" laptops, but now I want to go for 15,6" because of longer battery life, but I am still not sure about it, if 17" won't be better even with lower battery life.
Btw, on that video isn't older version of Inspiron 15 7000? Because on official DELL site is Inspiron 15 7000 without numeric keyboard and it also looks different.
Yes, I like the 13" XPS, but it's too small for me and also it's very expensive, I don't want to spent more than 1100 - 1300 euro for it.