which c band LNB should i buy?

[pinkrose]

Respected members
which c band LNB should i buy?
1.http://www.shopclues.com/universal-rainbow-branded-c-band-lnbf-high-gain-13k-dual-polarization-hd-ready.html
2.http://www.shopclues.com/universal-c-band-lnbf-dual-pol-single-out.html

Please suggest me from upper two options with reasons ,so i could understand how to buy lnb...
I hope there will be many good suggestions ..
Thank you

 

[chinnupepsi4all]

buy Solid C band Dual Polarity 17k LNB.... thts it

 

[pinkrose]

buy Solid C band Dual Polarity 17k LNB.... thts it

Technically and practically reason please