To a beginner, nothing, just to try as much as he can, and get an idea of what he want, then look for it second hand. Etha, Minis, Axes, Geo2 (great option now that can be upgraded with IV core bolt), DM11, something cheap and in good condition will do.
For a PRO, he should already know, and all the top brands got great options to choose. If he is PRO, he will probably got an sponsorship and is tied to a brand.