Ironically, the Soyuz vehicle has been taking a 'faster' approach to the ISS of late. Used to be a 1-2 day mission, and the new faster approach (tested on Progress vehicles first) is only about 4 hours.
However, the 4 hour is less comfortable since they stay in the seats and suits the whole time, since there is not really enough time to get out, and get back in.
Whereas on the 2 day approach they can get out of the seats and move around.
Soyuz passengers are really folded tight into the seats, legs strapped tight. Dragon has more room in that regard. Easier to get in and out of the seats. (Dragon is designed for 7, flies for NASA with 4, and the first demo flight with just 2, so lots of room).
Soyuz has two modules (orbital and reentry) so there is privacy for a washroom.
There was a story about the toilet SpaceX is supplying but the take away from that is, its a surprise we will find out about after the mission.