In case you didn't know, the way Dhammawheel and Dharmawheel are managed, is such that both forum sites are specialised.
In the former, they are dedicated to the Theravada Buddhist teaching, practice and realization perspectives. In the latter, they are into the Mahayana's & Vajrayana's Buddhist teaching, practice and realization perspectives instead.
Also, to avoid confusion between Traditions and allow the clarity & space for definitive discussions of respective Traditions. Hence, you can see a distinction made between matters relating to the Dhamma & Dharma.
From their respective terms of service:
But some leeway is given ( I presume) when doing some inter-Tradition (e.g Vipassana & Shikantaza) comparatives and I have seen even non Buddhist comparisons done in these two forum sections: 'The Dhamma Free For All' & 'Lounge'
Hope this helps...