In summary, the YHT S401 is designed to upgrade their TV with high-quality sound (crisp dialogue, volume, bass, treble), without the hassle of multiple cables and son. It benefits from all the latest current technologies (3D-compatible HDMI, HDMI TV back, etc ...).
If you have a room "open", it is useless to acquire the YSP-2200, which will bring nothing more than the YHT-S401 (except for a little more power), so I recommend you acquire YHT-S401 me.
If you have the budget and a room "closed", in this case, the YSP-2200 is obvious !!!
For me, the only downside of the YHT-S401 is the aesthetic is minimalist and a little plastic, certainly compared to a more imposing YSP-2200, but is very classy.