“free”
CiviCRM is free. So are Drupal and WordPress.
Of course “free” means lots of different things:
Free beer
Free speech
Free reign
Which one of those matters most to you?
Just that it has zero up-front cost?
Or that it's built by a community that aims to empower the masses?
Or that it gives you virtually unlimited potential for customization?
Whichever one it is, it's good to think about which of these is most valuable to you.
Because even free kittens have a cost of ownership. And so does your open-source CRM.
All the best,
A.