when do you use SRT versus wms?

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LCN "does not" recommend the use of SRT screws is wood doors. LCN "only" recommends the use of Wood Screws in wood doors and frames, as noted on the installation instructions.
 Mounting Posts   Part Number  Door Thickness  L583-211  1 3/8"  L583-212  1 3/4" - See note section on SL1 trim  L583-213  2...
SRT "Self Reaming, & Tapping" screws are the default type screws shipped with LCN closers, when a specific screw type is not specified.   There are 3 standard lengths of SRT screws: 1-3/8" 1...
The SRT screw that is used for mounting the 1461 closer body is 1 3/8" long.Four screws are used to mount the closer body.