Whats the Difference Between GM Tech 2 & GM MDI Diagnostic Tool

There have GM Tech2 and GM MDI work for gm vehicles , but whats the difference for these 2 items ? Please check the details as bellow :

Whats-the-Difference-Between-GM-Tech-2-&-GM-MDI-Diagnostic-Tool

Item GM Tech 2 GM MDI
Language GM-English, Germany, Spanish , Japanese, French, Thai , Portuguese, Korean
SAAB-English
OPEL-English, Italian , Germany,Spanish
HOLDEN-English
SUZUKI-English
ISUZU-English
Multi-language: English, French, German, Japanese, Italian and so on.
Total 30 languages to choose.
Update Via 32MB Software Card can not update
Activation no need active yes
Advantage cannot plug original software card, but can support original program can support software from original factory
OS requirement no need connect to the PC Win XP only
Internet connection no need connect to the PC can not connect to the internet then install the software, because once connect internet, it will remind you update the software
Support Car Model Cannot support truck, only for cars, Support all GM systems 1992 thru current year. such as GM/ SAAB/ OPEL/ SUZUKI/ ISUZU/HOLDEN MDI can test all GM car from 1990-2012 year.
Support programing support reprogramming, but need to use with TIS2000 together support offline program,such as chevrolet,opel, but not for all cars