Direct Mail: Phone Number or Website?

[Ryan Ahlgrim]

I always enjoy hearing the different ways investors structure their direct mail campaigns. I'm planning on starting one in a few months but have some questions. 

Would it be better to put a phone number on the mailer for the seller to call me directly? Or should I give them a website address that would take the seller to a questionnaire where they can fill out information about the property they'd like to sell?

I assume the phone number would give me a better chance of getting my foot in the door and negotiating. But the questionnaire would help me quickly sift through deals and only focus on ones with potential.  

Thoughts?