go for the creepy crawlers,they are soft and grippy, but lose tread quiet quickly from what everyone is saying,but i hope mine dont go down too quickly.
personally i'd try the creepy cralers befor moving onto the try-alls because if you spend little money first and see if you like them then you can get some more after, rathert than keep getting expensive ones.
so basically, go for the creepy crawlers first (Y)
steve.