Paolo,Theories where the Higgs is not the quantum of an etnaeelmry field will often have limits in which it behaves like one, so, generically you should be able to tell the difference in principle, but in practice you may just be able to put bounds on some compositeness scale. If there really is something at 125 GeV, the focus for many years will be on measuring its properties to see if they’re precisely those of an SM Higgs (or a SUSY variant). Hopefully some difference will be found, otherwise life will get very boring.
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Paolo,Theories where the Higgs is not the quantum of an etnaeelmry field will often have limits in which it behaves like one, so, generically you should be able to tell the difference in principle, but in practice you may just be able to put bounds on some compositeness scale. If there really is something at 125 GeV, the focus for many years will be on measuring its properties to see if they’re precisely those of an SM Higgs (or a SUSY variant). Hopefully some difference will be found, otherwise life will get very boring.