Been to both, Nova Scotia would win out. In the region you have the very happening Halifax (great bars, clubs, music), Cape Breton - stunning scenery, very lively music scene and real soul. Then you can spin to New Brunswick - the most Irish city in North America - St. John - shopping and restaurants. Also in New Brunswick you've a wealth of sights and sounds, the Miramichi which was a settlement place for a lot of Irish and the region has a lot to offer during the day and night.
And then you have to spin to a place I called home for more than 2 years, Prince Edward Island. From nightlife to eating out (lobsters are excellent there - though I only had one) to golf, sea cruises, sights (it's the home of Anne of Green Gables), music and a really good local population.
So basically 2 weeks spinning around the 3 Maritime Provinces would offer a lot more than going out west, but then again, I admit to a bias.