Digital BW, The Print

I may not be searching right, but can someone tell me the difference 
between these two papers?  I have printed on both and I can only 
tell a very slight difference in print qualities--but cannot say one 
is better than the other.  In fact, I can barely tell any difference 
at all.  I am using Epson's stock drivers, matt black ink.  They 
both look pretty damn good to me.  Is there any practical reason to 
spend so much more on the Enhanced Matt?  Or perhaps the images I am 
printing are just not complex enough to bring out the true 
differences?

THanks