2wd will help to make you a better driver due to having to use more throttle control (discipline) and radio setup. Yes, 4wd is faster due to putting the power to all four wheels but most drivers don't learn throttle control discipline due to being able to power out of situations because of the 4wd. Personally, I became a better driver running 2wd 235mm classes a couple of years back locally when 2wd was still the "in" thing. It taught me alot about what I mentioned above, especially proper car setup for track and conditions.
It's not what you know; it's what you can prove.
The only thing that is for sure is that nothing is for sure!!!
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There are 2 things in life that are infinite: the universe and stupidity.