Reply to Traktor s4 for home use; what do I need for club use?

Hello, I am looking at getting a Traktor s4 for djing at home and small parties - I have just recently sold my CDJ 350s, and was either going to pick up a Traktor X1 and Soundcard to use with a mixer, or picking up a Traktor S4.

My question to you, is:

If I were to get a soundcard and X1 then this would be a portable setup for club use, but if I was to get an S4, this would be too big to bring to the club - SO, as I already have some experience using CDJs, would I only need to bring my laptop to clubs, leaving the S4 for home, and just Traktor and CDJs for clubs?

Or would I need a soundcard to bring to the clubs as well as my laptop?

Thanks, I'm new to using Traktor and digital DJing as a whole!