im now running a losi and i use to own a tc3 (yokomo mr4sp and hpi pro3 as well

). anyway both the losi and tc3 are really good kits. the losi handles a lot better than the tc3 on most conditions and the losi is almost tweak free. although the tc3 is easier to drive i got alot faster with the losi because of the more aggresive balance of the car.
in summary
losi is not as easy to drive compared to the tc3 so if u have alot of driving experience, i'd go with this car.