How would a President Cruz, Rubio, or Walker be different or same from the Trump administration? Would the GOP Congress be doing more, less or the same?

President Trump is a unique figure in American politics in that he is the first president to be elected without significant government experience. Moreover, he enjoys unified Republican control of Washington DC, but is seemingly handicapped by personal controversies that most likely would be absent experienced politicians.

If Cruz, Rubio, or Walker--three politicians thought to be most likely to be elected in the absence of Trump--were president instead how do you think the political and policy discussion would be today? Since those three would still be considered strongly conservative presidents how would their agenda's fare with Congress? Would they be able to rally the public to their side or would partisan polarization still leave them with middling job approval ratings?