IMHO, For me FS or a big bookshelf with Subwoofer
There is only a handful of FS that can go down to 20 hz and those that do are frikkin $$$$$$$. Most FS that I have heard rarely goes down to 30 hz, even 35 hz is not common, even if they do go down to 30 hz on its technical spec, they can not do this with the required SPL (depending on the listeners volume preference and type of music). An FS with a 8 inch woofer can only do so much bass compared to a 12 or 15 inch subwoofer
* Even today, 8 inch woofers is seldom seen in FS speakers, so expect less bass with a 7 or 6.5 inch woofers and its smaller brothers.
Once you have heard a properly setup 2.1 channel with BS or a FS for that matter, you would never go back to 2.0