Wandering Gyspy

Hello, I am also looking at applying for the MDev. This would be my second Masters. I have a Bachelors in History and a Masters in Sociology. I've worked with a small Delhi- based NGO for two years and have now decided to study further. Problem is, my grades as an undergrad are really no so great, and the Master's grades are much much better and I have also taken subjects like Urban Sociology and Urban Community Development which are relevant to the MDev course. Any idea if they give different weightage to each level of education? Really don't want an email saying, "unfortunately we only take the best and you are non-admissible" early on in the admission process. Also for recommendation letters, I was planning to get one from an undergraduate professor, and one from my postgraduate degree (Since I have changed disciplines). What do you think would be better? People who are more likely to vouch for me or people who I have worked with more recently? Any help would be really appreciated. Many Thanks