Okay, it's about time I killed some confusion around here.
The last time I checked, Oatmass was super fine, so now that we have another name for it on the market, some people are applying a distinction to one over the other. I know that Oatmass has a GI value of about 70-75, which makes it good for insulin spiking and therefore a product that can be had pre/during/post workout. Oats on the other hand have a GI value of about 50, which could be higher if one was to use it for the above mentioned timings.
Pulverising the Oat grain into a powder that resembles WP or finer still, does give it more surface area which makes it much easier for digestion as well as quick absorption. No rough fiber to slow anything down here.
I believe you would find oatmass (which for a short period of time was called oatmucle by Fitness central) to be the one and the same product given two different names by two different suppliers, which is only natural really. So go ahead and buy the cheaper one (not version since it's one and the same version) and save some money.
PS: You may find that my information re the GI index contradicts both web sites. That's because they're saying it's a slow carb and I'm saying it's a fast carb, one that can be used to spike one's insulin levels. What needs to be taken into consideration is the fact that we no longer have the oat grain in its original state, but rather in its highly processed state now. It's a difference that I've chosen to acknowledge, they (both companies) haven't...yet!
Fadi.