Hot Chocolate Bar vs. Coffee Bar (or both)?

I know I have previously posted about having a hot chocolate bar at my wedding in February, but my FH brought up the idea of also having a coffee bar for guests to enjoy with their cake (for those guests who will not be drinking alcohol at the wedding). His thought for the coffee bar is because his grandparents think it's appropriate to have coffee. My FH's sister got married early last month and did not have coffee available when the cake was served and his grandparents were not happy about it - it's been over a month since the wedding and his grandmother is still talking about it. Personally, I probably won't drink either at the wedding (and neither will my FH), but I cannot decide on which one to do, or if we should do both. If we did both, I'd probably just bring a Keruig and get hot chocolate K-cups and different types of coffee K-cups. What are your thoughts?