Questions on webmerge functionalities in Salesforce?

Hey ,

I am currently working on a project and i have to decide weither to choose s-docs , webmerge or conga . I know there is a large difference in the pricing but i am also thinking in term of the functionalities i want to use to create my templates .

Here are some questions that i cannot find any answer. if someone has already worked with the tools , any help will be appreciated :

For conga and webmerge : is there any possibility to edit the template after the merge ?

For S-docs : Can i create a follow up task after the merge ?

For webmerge : there is quite a lot i had issues finding my answers on the support :

Can i send an automatic email right after the merge ?

Can i add a condition so when the user click on the webmerge button it will only fire if certain conditions are valid ?

And finally can i hide a whole table if its is empty so it will not display only the headers ?

Thank you very much .