hi the question is do you want to be competitive and win races or just for fun?and as you are new to niro 1/10 then at the end of the day just from experience it will take a while before you can drive a nitro car to its full potential and even then it will be hard, sure mugen, xray, kyosho,serpent,team magic all have great cars so it will come down to (not in any order):
1/ can I get parts before the next race day?make sure you have a number of suppliers as not all have stock
2/ are parts $$$$ (compare)
3/ what engine will I use? (very important)
4/check out when that car was last released as there may be a newmodel on the horizon
5/is support easily accessible for this car (who cars if no one races your car at your local track as long as you can get support ie rctech else where, plus I think this makes you learn your car more and you dont have to copy everyone elses setup get out and practise and get your own setup thats what I did.
6/dont rush into it research the cars
7/what upgrades are available?
8/what radio gear will be going in it some Rx are a tight fit
9/can i run a lipo rx easily will it fit with a regultor
some companies who build cars also make accessories like setup stations, starter boxes, etc etc you can keep it all to the one brand if you want.
I am not suggesting you get a TM car look at all your options
but I did even thou no-one else had that brand at my track but through practise, a good tuned engine and the correct setup the results couldnt be better.
all the best