Which driveshaft loop?

I have both sitting here...one is installed and the other is brand new.
Which is better or is it all the same?

http://www.jcwhitney.com/lakewood-driveshaft-loops/p3057352.jcwx?filterid=c3674d413u0j1

http://www.manciniracing.com/ma19bofrdrsh.html

We will just say I got a roller....did not remember there being one installed so found the other and now I have both haha.