請問vizio與sharp的電視該如何選擇？

最近考慮每一台50"以上的lcd hdtv回家看，雖然sony是我家人最喜愛的品牌，不過他的電視真的太貴了些。

因此只有考慮vizio和sharp的，這兩台電視都可以在北美的costco買的到。

Sharp 52” AQUOS C77UN Series HDTVs
#
Screen Size: 52”
#
Aspect Ratio: 16:9
#
Resolution: 1920 x 1080
#
Refresh Rate: 120Hz
#
Spectral Contrast Engine Level XD (Extreme Dark)
#
Brightness 450cd/m2
#
Response Time: 4ms
#
Viewing Angle: 176°H / 176°V
#
Tuner: NTSC/ATSC/QAM


Vizio 55"

#
Screen Size: 55" (54.64" diagonal)
#
Aspect Ratio: 16:9
#
Resolution: 1920 x 1080
#
Contrast Ratio: 50,000:1 (with DCR)
#
Response Time: 5ms
#
Brightness: 500 cd/m2 (typical)
#
Viewable Angle (HxV): 178° x 178°

價格sharp比vizio便宜了三百快錢，對於電視我真的很不了解，請各位給我些建議吧。