Difference between XTOOL X100 Pad2 and EZ500

I want to figure out the difference between Xtool X100 http://www.xtooleshop.com/wholesale/xtool-pad2-pro-tablet-key-programmer-with-special-functions.html and EZ500.And to see how many Volkswagen cars are able to Pad2?
Answer to their difference:
1. VAG VW 4th 5th IMMO key programming (+& -)
XTOOL X100 PAD2 FULL Set can program VAG VW 4th 5th IMMO key, here a post on how to do: http://blog.xtooleshop.com/xtool-x100-pad-2-full-set-program-vag-vw-4th-5th-immo-key/
If your XTOOL X100 PAD2 without VAG 4th 5th IMMO key programming function, order a KC100 adapter, this is a little bit expensive, maybe you contact the seller they would give you discount especially when they promote.

2. 4 system diagnosis VS full system diagnosis
You can see XTOOL X100 PAD2 have four systems diagnosis (Engine, Brakes, Central Electrics, Airbag), no full-system diagnosis. And XTOOL EZ500 have full-system diagnosis option. EZ500 is powerful with many functions and vehicle coverage, I already prepare a post on all EZ500 functions and testable car models & year:
http://blog.xtooleshop.com/a-good-choice-for-car-repair-workshop-new-xtool-x-100-pad-2-pro/
3. Price is difference
http://www.xtooleshop.com/wholesale/xtool-pad2-pro-tablet-key-programmer-with-special-functions.html plus VAG 4th 5th immo key: $879 incl. shipping cost + one year free update online (One key update) + after-sale support

Xtool x100 Pad2 with no VAG 4th 5th immo key: $689 incl. shipping cost + one year free update online (One key update) + after-sale support

XTOOL KC100 VW 4th & 5th IMMO Adapter for X-100 PAD2: $309 incl. shipping cost

http://www.xtooleshop.com/wholesale/xtool-ez500-hd-heavy-duty-diagnosis-system-with-special-function.html (same as ps80): $769 ncl. shipping cost + one year free update online (One key update) + after-sale support