Quality of crepe soles

Hi I've been wearing the Clarks desert boot for about a year now and the crepe sole is probably the most comfortable soles I ever had. However recently when I visited Clarks they had a new line of shoes with crepe soles that had a 'sharper' trim on the sides (almost as sharp as the EVA sole that Grenson uses). Which got me thinking are they the same crepe sole or are there different grade of crepes? If so how do you tell is they are good quality or not? Apparently Allen Edmonds crepe soles are better quality than Clarks desert boots.

For the sake of reference the two Clarks shoes are:

Desert boots:

http://www.clarks.co.uk/p/00111769

Clarks Desert legend (sharper trim):

http://www.clarks.co.uk/p/20351722

Thanks in advanced :)

Sorry I'm just bumping this because I went to my local cobbler and they showed me what they call 'quality crepe'. They looked a bit finer in the roughness of the texture and felt a bit harder.

The key concern is that the cobbler claimed that crepe are slippery in the rain. Are they? My desert boots have never failed me in the rain before so its a bit puzzling.

Interestingly when I said I prefer the 'low-quality' crepe asking them if they could put that on for me they refused to do so. Are high quality crepe so much better than cheap crepes?

Thank you both for your replies. I've got a bit more confidence in them now so I went to the cobblers today and asked them to resole my burgundy/red mahogany shoes with crepe (the firm one that is not the cloud one). 

I'll post some picture and the verdict on it later when I get it back in a weeks time.

Fingers crossed!

Sorry for the late reply my cobbler took longer than he thought (new years backlog and all). I've got the shoes back today and my verdict is simple. Its great! I went for the more dense crepe and they are very grippy, comfortable and soft. They look quite formal from the side enough for me to prefer them over other rubber alternatives like dainite and vibram. Although my cobbler did not have them you can get them in black too. I haven't tried them out in the rain but I do have a good feeling about them under wet conditions too (obviously not ice). In future when I resole I will actively opt for crepes.