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The electromagnetic elastic form factors of pseudoscalar and vector mesonsare analyzed for space-like momentum transfers in terms of relativistic quarkmodels based on the Hamiltonian light-front formalism elaborated in differentreference frames (q+ 0 and q+ <> 0). As far as the one-body approximation forthe electromagnetic current operator is concerned, it is shown that thepredictions of the light-front approach at q+=0 should be preferred,particularly in case of light hadrons, because of: i) the relevant role playedby the Z-graph at q+ <> 0, and ii) the appropriate elimination of spuriouseffects, related to the orientation of the null hyperplane where thelight-front wave function is defined.Comment: version to appear in Phys. Rev. C. No change in the results and in  the conclusion

physical review. c. nuclear physics/physical review. c, nuclear physics

Comparison among Hamiltonian light-front formalisms at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>q</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>=</mml:mo><mml:mn>0</mml:mn><mml:mn /></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>q</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:…

Comparison among Hamiltonian light-front formalisms atq+=0andq+