There will be a def difference in running lipo vs NiMh. When I switched I was running 18th scale and my run time jumped 30% changing to lipo. The punch was pretty close to being the same as NiMh, but it lasted nearly the entire runtime instead of fading quickly (a few minutes) like NiMh does.

Plus with lipo its charge and run, no discharging or conditioning like you need to do if you're going to get the most/best from NiMh. You can run and recharge lipo as many times a day as you want, NiMh - can't do that.

There's a def difference.