In this work, the characteristic emission lines of Cu, Au, Ag, Al, Ni, and Pd are obtained in a Q-switched Nd: YAG laser-induced plasma. Furthermore, the signal enhancement is carried out separately by making use of the continuous-wave (CW) CO_2 laser as well as the spark discharge. The former enhances the signal intensity via plasma heating according to the inverse Bremsstrahlung (IB) mechanism, whereas the latter relies on plasma reheating and subsequent lifetime elongation. As a consequence, both methods lead to the temperature rise of the plasma. In addition, the corresponding electron density of the plasma is notably elevated in spark-assisted LIBS (SA-LIBS). It is also shown that the enhancement of the ionic lines is much higher in SA-LIBS against the other one. Although the CW-CO_2 laser benefits an electrodeless arrangement, SA-LIBS is considered to be a better candidate due to its facile and low-cost setup.