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There are pros and cons to anything, but the pros of overhead cams greatly outweigh any cons versus a pushrod motor. It is not even close. Again, what other manufacture puts any push rod motors in their cars?
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That is actually not true. The reason manufacturers went to overhead cam motors was driven by taxes. There are countries that do or maybe did tax based on displacement. An overhead cam motor has advantages at high rpm traditionally (although looking at the redlines of the LS7 and LS3 they have managed to worked around that quite successfully). You could spin the engine at higher rpm to produce more peak hp and did not have to rely on displacement which has tax implications.