Multisite ? or other solutions

I am considering using domain access module to do the following:

I am building a mother site, with the domain name exmaple.com, and then in the future, my other partners might want to have the service of mysite, so I give them a copy of my site, without most of the content, except on one type of content(globalcontent), let's say that site is lovethisexample.com

i.e. the second site, lovethisexample.com will have the same type of content but generate its own content. And globalcontent will have aggregate the globalcontent from both example.com and lovethisexample.com, and be available in list format to the users in both example.com and lovethisexample.com. If a user from example.com like an item from the list of globalcontent, and that item happen to be in lovethisexample.com, the user has to go to lovethisexample.com to access it.

the user from lovethisexample.com will have to register to example.com in order to access the content in example.com, vice versa. However, globalcontent

somehow, I think domain access is not the best solution for this, however, at the moment could not think of a better solution, so suggestion on best way to approach this is appreciated.