Does a startup’s success depend more on the idea or the team?

Both. A great idea with the wrong team will result in failure, equally a great team with the wrong idea will as well.

I'd say of the two a great idea is more important than a great team, as a flawed implementation of a great idea is better than a great implementation of a flawed idea.

Chicken and Egg scenario, idea vs team - execution strategy is the driving success factor. You may say that is the team though the marketing and promotion may be hired out. There are a lot of good ideas that never come to market. Equally there are many interior products that do may it into the market place solely on their promotion.  
Marketing and a fully flushed out idea will help any start up.

You have to have both. The idea has to actually be practical, but there needs to be a team to execute the business strategy and be nimble and responsive.

From my point of view both is important, but team is maybe little bit more important. 
I was working in the past with many startups with great ideas. Most of failure were related
to team problems.

Every year there are a multitude of startups that fail with a great idea, or succeed while doing something that already exists. Your ability to create and sell a product will always outweigh the idea.