Re: squeeze page on main domain name or www.domainname.com/squeezepage.html
There is no evidence to be produced yet that Google's algorithms favor .info
And the question here as well is who are you making your product for Google or customers although I do understand that you need to be as Google friendly as you can be careful not to undermine your customers for the sake of Goolge.
I say this because I have seen a lot of "Keyword Rich" articles that make no sense to the reader and this is of course just bad mojo for ur business, Google is not going to buy your product, your prospects will...hopefully.
Having said this When was the last time you proffered a .info, ,net, .ws etc as a more reliable source of content.
I know that you were asking specifically about SEO but one is not separate from the other.