Its down to ease of building it. If a newbie who has not done this before building a 2wd would be an easier task to do than a 4wd. Not saying that you couldnt but one gearbox is much easier than two.
The B4 RTR comes with everything in and is task free, so is really down to what you want, to build it yourself and add a specific named brand esc, servo and radio.
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