I want to share some articles and links shared with me.

http://www.thetruthaboutcars.com/2010/10/hammer-time-carfax-vs-autocheck/
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Best Answer - Chosen by Asker

I'd go with AutoCheck. When a dealer auction does a post sale inspection on a vehicle and they find frame damage they report it to AutoCheck. I've seen a lot of cars come up completely clean on Carfax only to find frame damage or something else on AutoCheck. For $3.50 you can use checkthatvin.com, but that only really checks for a salvage title - not minor accidents.
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Best Answer - Chosen by Asker

Autocheck will give you more up to date information plus they have never been sued like carfax was because their information was lacking the true facts.....

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Reply by Philip Zelinger on July 17, 2009 at 11:29am

Hi Chris,

To add to the comments of my fellow ADM members on the CarFax vs. AutoCheck issue I suggest the following points:

1) These applications are extremely consumer facing and the "Mind Share" and Market Share" earned by CarFax is DOMINANT and therefor much more credible. For that reason, at least for the foreseeable future, I have to recommend CarFax to the affiliated automotive advertising agencies and auto dealer/vendor clients of Ad Agency Online, L.L.C. - and I do!

2) Some processes - like credit applications - warrant having more than one solution. However, since there is no critical information differentiator - from the customer's perspective - between CarFax and AutoCheck the added expense and distraction to the customer would not be justified. The "redundant" expenses assigned to AutoCheck would be better invested in another vertical - like SEM PPC investments or other conversion tools and/or lead generators.

3) Sometimes, bigger actually is better! CarFax is BIGGER that AutoCheck in both the mind of the consumer and the dealer and to my knowledge CarFax has been extremely co-operative when integrating with my vendor clients. Untill and unless they drop the ball or get too big for their britches - like AutoTrader.Com - I see no reason to dilute my loyalty or my dealer/clients investments in CarFax.

4) The business model and related marketing plan for CarFax extends into reseller agreements, shared applications and their own staff in both sales and support. AutoCheck seems to exist through their resellers which evidences their lack of resources which will undoubtedly limit their services and support vs. CarFax.

Simply put - if it aint broke don't fix it and CarFax aint broke!