Hello,
Currently i am planning to use either one of the billing system. Any recommendation/advise?
Thank you

WHMCS is better than WHMAutopilot according to me. It's more easy to use.

Personally, WHMCS. Due to the fact WHMCS includes alot more for the price than Autopilot.

If that's not enough WHMCS comes with:

DirectI reseller Account
Maxmind Fraud protection

Plus a few other Plugins that can be found here, for an extra price:

whmcs.com/plugins.php

Overall, Matt and the team from WHMCS have produced an industry leading product, that numerous members of this board would be more than happy to Agree.

Full specifications of both products can be cross referenced if you wanted to know precisely what they both included.

Personaly i think WHMCS is better value, and is much more easy to use and you get a load of extras

WHMAutopilot has friendlier support that will work with you to get your site billing up and running.