What's The Best Way to Show Contents from wp sites?

Hello Everybody:

Recently, I have been looking for ways to showcase the contents from wp sites based on video theme, directory, theme, classified theme and more to my another wp site which is not based on premiumpress theme.

Or what’s the best way to combine all 3/4 themes to make a single site with different features. I tried MU sites but somehow it did not work good for me.

Hoping to get a good solution.

Thanks