Legion is best for beginners if you don’t care for speed followed by Deeps. Sands has a good range of tricks you can use but it’s weird. Death is most popular among the elite because 1) it’s fast, 2) still has some tricks and 3) people basically learned to play it by heart (like I would have no idea how to play Deeps right now). Actually, Void offers potentially faster runs, and I’ve seen some people use it to showcase, but it’s just dark and you can’t see anything.
Also, I’d like to point out that in the last patch many strategies in this guide were rendered obsolete for all but the most op builds. You should focus on isolating, blocking off and positioning instead of hoarding. Zantai evidently does not want the game to be played like I described here.