I recently look into my ranks and where my BLD PB's lie in the world ranks. It was interesting to see that for Multi-BLD, my PB put me ~73 and recently I've been averaging around 90th place. For 3bld the 100th best result (iirc) is 26 seconds and my PB is 47.25.. I must say I've done almost more multibld attempts than 3bld (not really but close tbh) but yet since more people do 3bld, my pb puts me at a very lower rank.
Similarly, for 5bld (which I don't practice that much anymore but will after my comp this weekend) my pb puts me around 110th place or so in the world, and I do not practice much. Probably done <40 solves. But for 4bld, which I practice a little bit more, I rank much lower once again with my pb of 5:00.
So basically this means that in less popular events, it is easier. Although these events are much harder sometimes eg. 5bld, 15+ cubes multibld and is thus why they are less popular or competed in.
So, in my eyes multi-blind actually seems like the easiest one, but hey, I've done almost 200 attempts over ~280 days (aka this year) which is a lot, trust me. So maybe because I am so focused on the event, it makes the goal seem easier and more reachable. Perhaps all this practice is the cause why I say multi-blind is the easist to get world class. To get top100 you need 16 points. Which, with lots of dedication, you could probably reach in a year. I mean lots and lots of dedication.
Cheers!