Direct mail marketing vs Cold Calling via text vs Traditional cold calling

[Tom Goundry]

What are the differences in effectiveness, pros, and cons between direct mail marketing, cold calling via text, and traditional cold calling in the real estate industry, and what factors should someone considering cold calling for real estate take into account?

Looking to start up a cold calling operation to buy retail properties like gas stations, c-stores, strip malls, shopping centers, etc. Does anybody know effective this will be in my industry?