The answer is both. And it is stupid not to use both.
Renewable is problematic because it has some problems with efficiency, but to some degree that is rapidly changing. You have solar panels today that use much better technology that reflect light and use it so much more efficiently than previous models that it isn't even funny. Even wind turbines are much better than before, not to mention you can put them on land that essentially isn't being used for anything else. They are profitable, so I don't really see how someone could be against them. Its almost anti-capitalistic.
Nuclear is phenomenal in terms of efficiency, but has some messy side effects. You can cope with this by putting the nuclear waste in rock formations that do not allow it to seep through at any appreciable rate (France does this). But then you have to deal with the PR machine to make it look OK, not to mention you can only store so much nuclear waste.
Ideally, we need to find a cost efficient way to ship nuclear waste into space or to somehow make it non-radioactive (create some kind of enzyme or engineer some kind of bacteria that can do this). The second option is far-fetched, but people once said flying was far-fetched, not to mention using nuclear energy.
But anyone who is strongly against either nuclear energy or renewable energy is more or less just plain foolish.
We had two bags of grass, seventy-five pellets of mescaline, five sheets of high-powered blotter acid, a salt shaker half full of cocaine, a whole galaxy of multi-colored uppers, downers, screamers, laughers…Also a quart of tequila, a quart of rum, a case of beer, a pint of raw ether and two dozen amyls. The only thing that really worried me was the ether. There is nothing in the world more helpless and irresponsible and depraved than a man in the depths of an ether binge. –Raoul Duke
It is hard to shed anything but crocodile tears over White House speechwriter Patrick Buchanan's tragic analysis of the Nixon debacle. "It's like Sisyphus," he said. "We rolled the rock all the way up the mountain...and it rolled right back down on us...." Neither Sisyphus nor the commander of the Light Brigade nor Pat Buchanan had the time or any real inclination to question what they were doing...a martyr, to the bitter end, to a "flawed" cause and a narrow, atavistic concept of conservative politics that has done more damage to itself and the country in less than six years than its liberal enemies could have done in two or three decades. -Hunter S. Thompson
