AsteriskNOW or Asterisk?

Hi,

we are switching from 3CX to asterisk. We have 3 sites that use voip and want to move all to asterisk. As with 3CX we want all offices liked so that extension numbers just need to be dialled.

My real question is it best to just install AsteriskNOW or is it better to do the other option? We are having dedicated PC’s as our PBX’s. AsteriskNOW obviosuly seems the easy option but not sure if anything is missing from it?

As we also plan to make out own dialler that will be linked to our inhouse database so we also want to take advantge of developing the system.

Thanks