Compare Apple iPad 4 vs Dell Latitude10 vs HP Elite Pad900 vs Lenovo Think Pad Tab2 ?

I am looking to buy a new pad and as per the research i got hold a list of 4 best gimmick gadgets as per my concern. However, comparing their specifications like in terms of display and software house confused my mind. And i finally decided to get a new Pad from these Ipad's. I want anyone who ows or hold information and know which one will be the best amongst these four then please help here and suggest you valuable options.

My main constraint is it weight it must be lighter and easier to carry.

thanks in advance.

AppleiPad4 measures 9.4 mm in thickness, Dell Latitude10 measures 10.5 mm in thickness, HPElitePad 900 measures 9.2 mm in thickness, LenovoThinkPadTab2 measures 9.8 mm in thickness.

However, as per your constraint weight i would suggest you to go for HPElite Pad 900 it weighs nearly 630 gms. But if you want it to be boost up with high specificaitons go with Apple iPad4.