Distributing Forms, need some form of signature, What is recipient doesnt have a (paid) Adobe

So relatively new to ADOBE PDF forms, I am currently trying to determine if PDF, Word, or Excel is my best way to build this form. There will be multiple drop downs, in the form and in the end I will need some type of signature or the person filling out the form.

So I dont know what level of adobe all these users will have so I want to go in with the assumption all they have is an unpaid version of adobe (I guess that would be just "Reader"), If that is the case can those users still fill out the form and sign, what if I add scripts into it (thinking down the road).

Another thign that may complicate things is I intend to "attach" or "embed" a excel table into the form that Id like them to fill out and send back (ideally automatically attached to the filled out form).

Thanks!