Stripe Mat Which DDR Wii Mats Are Better, The Foam Or Non-slip?

Which DDR Wii mats are better, the foam or non-slip? - stripe mat

http://ddrgame.stores.yahoo.net/dance-da ...
The slip mats have a high sensitivity and have a surface "scratching".

http://ddrgame.stores.yahoo.net/dance-da ...
The foam inserts of other carpets of 1 inch, but as the average sensitivity.

Which is better? Thank you.