There's no general answer for the best shipping method or how much you can ship with a certain shipping line, it completely depends on your country.
The same shipping service can be the best to one country and completely useless to the next. You can't even say that the EU or another geographical region will have the same preferred agent.
It's important to know that these answers are based on a large community service (qualitative and quantitative). If you're interested in numbers (delivery time, price) alone, or if you're country is not part of the survey check out our shipping calculator. It's the best solution for agent and shipping price comparisons.