If you're looking to race RC cars I would only consider the Losi Mini8 (if there is a suitable club nearby that races that 'micro' class)...
The top two in your list are suitable for 'bashing' - of those I'd go for the Traxxas which will likely be better quality & have better spare parts availability over the other one.
If you want to RACE 1/10 buggies - where you will find countless clubs all over the UK - then I would consider a 2wd brushless set up such as a B4.1 or Losi 22 - both available as RTR (ready to run) set ups for around your price range.
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