The LTR wide terminal structure increases rated power for a similar sized resistor. In the table here a 1206 inch-size LTR resistor is rated to 1W compared to a similar sized device at 0.25W. When power is kept constant, the LTR series resistor will generally have a smaller form factor. The bottom right image shows an LTR18 1W resistor that is 60% smaller than a similar rated power device.