The participants in a good group discussion should share a lot more of their opinions than facts.
a fairly even amount of facts and opinions.
a lot more facts than their opinions.
only facts and none of their opinions.

I would say, "a fairly even amount of facts and opinions."

Explanation:

Not saying this is right. It seems the best option since you would need facts but also opinions.

industrialization in great britain began with the global 'industrial revolution', a pioneer. industrialization in russia was the last in europe, a laggard.

great britain’s industrialization was driven by individual citizens, while russia’s was guided by the government.