Firstly, i notice that its your first post. So a warm welcome to the Lure Forum Pat !!
Secondly, whilst i am no expert in DTM's, from my experience, the Surf will 'bite-in' more in a big swell, or when a surf is running. So i'd describe it as a 'wild water' choice. The Slim / Sld can pretty much be used in any conditions, other than when a big swell may be running, and you need the extra oomphhh of the Surf.
They all catch fish though, and i'm sure that some of the guys will be along shortly with some additional info.
Secondly, whilst i am no expert in DTM's, from my experience, the Surf will 'bite-in' more in a big swell, or when a surf is running. So i'd describe it as a 'wild water' choice. The Slim / Sld can pretty much be used in any conditions, other than when a big swell may be running, and you need the extra oomphhh of the Surf.
They all catch fish though, and i'm sure that some of the guys will be along shortly with some additional info.