JotForms are not only easy to use in terms of form creation but they offer alot of ADDONS! My clients don't have to leave the form to make a payment and I was able to link it to my Google Forms as well!
Not to mention just the above, but I'm an Amazon nut. I'm a Prime member which comes in handy for shipping and special insights on products; I love Amazon music, it doesn't limit you like iTunes. Since I love shopping online I use Amazon alot.