A false choice IMO. Mass voters have voted for libertarians many times and that would be a whole lot better than a "big government conservative" like Romney. The main solution to federal overreach is to shrink the federal government. For example the 1/2 billion to Planned Parenthood every year would go away not because some conservatives take on PP, but because it's out of scope and we can't afford it.
But strong conservative views would help a lot PP spent millions to defeat Romney (e.g. running ads here in Va). Romney did not fight against them, but "clarified" his views about them instead. That didn't inspire Virginia conservatives to say the least.
This is going to take strategy and I see a lack of a sane strategy on FR.