As in everything some manufactures are the premium brands ie Tekin, LRP.Orion etc. Others are just rebranded versions of the same controllers etc.
But to be honest if only racing 2wd and an 8.5/9.5 motor an esc 60amp or over would probably be ok. I just wanted to be safe so went for the 120amp version.
Also make sure its 2S Lipo compatable.
Like I said I have only just gotten involved with toy cars
but lots of research online and through this forum has really helped my admittedly limited understanding.
Good luck
Ben