Thess sites change their adverts so swiftly that if you link to an advert it never works.
There are 3 things to think about. The rest is academic and anyway will be out of date by next week.
Screen size - battery life - weight.
Forget the HDD size, it is not important. If you are on the road you will only carry that info that you need. Back-up and info will be stored at Base.
Most of us can not tell the difference between the working speed of one or the other.
The cost of your software will annihilate the price difference anyway.