Which of the two party conventions do you think was more effective in helping its respective party's nominee?

A lot of it will depend on your political tilt. I'm pretty much in the "same" camp. A few points bump on both. However both were seriously flawed. I saw how fractured the Democrats were where Bernie was still the star. They paraded the same old same old whiny stuff. Republicans were too skewed on throwing harpoons vs. talking about actual fixes. It's all about trying to energize people to show up and vote. I don't recall the viewership ratings but I did watch more of the Republican as I only had iPad summaries as I was in Europe the past week. All political theater....

The Republican Party rejuvenated the American fighting spirit. The Democratic Party whined, opined, and complained about the transgressions against them. And Hillary tried to explain why so many don't like her.

I think the Republican Convention was more important for their candidate. I doubt many did not know about Hillary. I think this is confirmed by the numbers of who tuned into each.