Well, I wouldn't suggest running your good packs on the E. If you decide to get an E, I would just hold off and get some ok packs for it. Wouldn't want to overuse your good race packs now, would ya???
Pros and cons. Well, have you ever had a nitro vehicle before??? If you have, then you have some knowledge of tuning. That is the biggest thing for people to learn. And the hardest.
Nitro gives you longer run times with less down time in between runs; electric has longer down times, but, in most cases, can be upgraded with a little less cost and have more power. Plus it's easy. Plus it's a little cleaner. But, you can upgrade the Nitro to a .21 or XTM's new 24.7 motor and get some amazing power (if tuned correctly) out of it. AND long run times.
I couldn't decide so I have one of each

. The stock T motor is really boring for me (since my E is ridiculously fast), so I'm in the process of converting to .21 power.
Check out MaxxTraxx dot com for some other good info on these trucks.