HW Xerun V3.1, which one?

[The Dark Knight]

I'm thinking about getting a Hobby Wing Xerun 120a V3.1 esc for my 2wd buggy, however, there seems to be 2 versions of it:

http://www.hobbywing.com/product_show.asp?id=284

http://www.hobbywing.com/product_show.asp?id=289

Can anyone tell which version is best for offroad?

My next question is, I already have the LCD programme card for my HW Just Stock esc, do I need to get another LCD programme card to use with the V3.1? Or am I ok to use the one I already have on both escs?