First , WELCOME
The reall question I'm getting is , Electric or Nitro. This is more of a personal question. For me I'm a car guy (petrol head, gear head) so dealling w/ engines, tunning, etc is second nature, so to speak. Some people don't really like the aspect of tunning and stuff and if you live in a cooler climate the idea of not being able to run in the snow (as a general rule, sorta). It all depends on if you want electric or nitro.
The one thing that I will recomend is, IMO, I would get the new version of either kit. The 3.3 will be improved in many ways vs the 2.5. While the 2.5 is a bit cheaper you will be better off w/ the upgraded radio, engine, etc.
When it comes to electric (not really my thing), from what I understand, brushless is the way to go which will add a lot of $$$ to the pot but everyone on here is very happy w/ that type motor.
If you really want my opinion then I say NITRO