It depends on what tour using it on. On a glider, long distance plane or something you are not punching (low draw plane) the throttle at all with li-ion pack would pry be the way to go. But on 3d, acro, edf (high draw plane) the lipo is the way to go.
Either way the 6200 would pry give a little more run time. If weight is a factor the li-ion would be lighter than the lipo per mah. But again only good for low draw setup.