- HW-H450 has an additional HDMI input and HDMI output (HW-H430 does not have this)
- Both have a USB port, an auxiliary input and an optical digital input
- Digital Sound Connect is possible with both
- The dimensions are different:
HW-H450 = 957 x 59.5 x 66.5 mm (Main), 175 x 362 x 295 mm (subwoofer)
HW-H430 = 906 x 70 x 45 mm (Main), 178 x 360 x 295 mm (subwoofer)
The sound bars are from 40 inch TVs anyway shorter than the width, but may safely can to it still orient something. For me, it has become the HW-H450, which allows me to connect another device without having to change cables since. A direct comparison I can not therefore provide - but it should provide a better output than the standard TV boxes both devices ;-)
I hope nevertheless to have helped.