What batteries to buy and why?

[skellyo]

IMO, these discharge graphs are the only way to objectively compare the cells without taking cost into consideration. Being able to see how a cell holds voltage under load throughout its capacity allows me to see that ideally one cell could keep a higher speed in a vehicle longer than another cell.

With cost being no object, why would I want to buy a cell that sags more under load at 50% capacity versus one that doesn't sag under load until say 80% capacity? It's only logical to want a cell that maintains a more constant performance throughout the capacity of the cell, is it not?

Edit: Took too long to post and bumped down, but this was in response to BrianG