HP TouchSmart Tablet Comparison Help??

[Pyzon]

I am trying to compare a couple of HP Tablets and am having great trouble getting good technical comparisons.

The two models are TX2635US and TX2-1020US.

At face value (and deeper) they seem almost identical, but the TX2635 US has a S-video out, and a "Wacom" touch sensitive screen that if I understand correctly can react to the pressure of the pen on the screen.

Can anyone offer more details of what I should be aware of with these or the seemingly endless number of similar models ?

Also, is it true that the models with TX1XXX are older models compared to TX2XXX ? I don't want to end up with old technology if I can help it.

Thanks for any help offered.

Pyzon