Over the last 60 years, the GOP has controlled the White House about 60% of the time. Yet, the GOP has not significantly slowed the growth of government - which is our biggest problem. In fact, some of the most egregious big-government legislation has been passed under GOP Presidents.
So, in practice, both parties' programs are closer to Karl Marx than to the constitution.
The only edge I could give to the GOP is that a GOP President seems to appoint Supreme Court Justices that are more conservative, although that has in some cases backfired.
The test will come in June when the Supreme Court delivers its verdict on Obamacare. If the Court doesn't at least find the Obamacare mandate unconstitutional, I'll know for certain that there's not a dime's worth of difference between a GOP and a Rat presidency. If that's the case, I will certainly not vote for Romney.
A case could be made that it might be better for our country to have GOP House and an Obama Presidency. The resulting gridlock would better keep the bastards in both parties in check.
You have a few examples of how the current Republican controlled House has checked the current White House agenda?