I just saw that one of my friends did a research where people give merit most times and that is reason why I told you some specific board because it can help you to get more merit,you just need to be active and post something there but it is your choise you can also post at another board if you want.
I just have wanted to say merit has been introduced for recognizing quality post/having quality post. The research has been done for finding out where quality post are being posted and which one is most active in terms of pouring merit. It has not been done for finding out where people should post for getting most merit.
Take it easy man. I am just trying to pointing out the purpose of merit.