Share 'Online survey tool - Zoomerang vs. Survey Monkey'

I want to build a quick and simple online form that organisations can use to apply for grants, get further info ,etc. I've used Zoomerang in the past but also know about Survey Monkey. Both of these cost money (although offer a discount for non-profits) are there any other tools out there that people prefer to use? Or if you use either Zoomerang or Survey Monkey, are there any advantages using on…