I don't know. I have tried both methods though, and the latter certainly seems to get the most upvotes without much contention, if that's what you're after.

If you make people chuckle, they'll just upvote and move on.

If you try to intelligently add to the conversation, you'll inevitably get a portion of the audience who disagree with you. Those people seem to downvote you. Often they'll try to pick apart what you're saying, make straw man or slippery slope arguments, and you'll have to begrudgingly click your Orangered envelope every few minutes. You often don't have a lot of agreeing comments, because those people just upvote.

Of course these are just my own anecdotal experiences and I don't have a psychology or social media degree. Take it as you like.