I want the most BTU per cord of wood. How much it weighs does not matter because I have no constraints on how much weight I can move or store. I am limited by volume...number of cords.
This is what I found. Numbers are millions of BTU's per cord.
Ash 20
Birch 20
Beech 28
Maple 24
Red Oak 25
Poplar 16
White Pine 14
Other factors like drying time, processing effort, ease of procurement, cost, amount of ash, and rate/duration of burn are considerations. For me, maple and oak are the best choices.
One size does not fit all. What makes sense for me is not likely to be the best choice for you.
In my business, many people I sell to are cost driven. One of my competitors sells ash for $75/face cord ($225/cord). I could charge $85/FC ($255/cord) and offer better value. 14% higher price for 25% more BTUs but many people buy on price. So, I charge $225 as that is what the market price is.