Losi 2.0 vs Losi 1.0

hey guys i am in the process of selling my e-revo roller on ebay and i need to know the differences between the 2.0 and 1.0.because the 1.0 is alot cheaper i think i am going to buy the and maybe start upgrading it slowly with 2.0 parts if the 2.0 is alot better.And 1 more Q shuld i run it with the xcelerion combo 2100kv or the mmm combo 2200kv.Thank you for your time.