It really depends on how trivial the idea is and if there are any significant difficulties with implementation. If it's something simple and easy to replicate,

It really depends on how trivial the idea is and if there are any significant difficulties with implementation. If it's something simple and easy to replicate, then those with better marketing will win. But if it's a technically hard product, then it comes down to execution. In either case being first to the market matters only if you have a trully innovative idea with immediate mass appeal.