Simple Queues vs Queue Tree

RouterOS Beginner Basics
1

Pardon me if this have been already replied in the forum.
I have CCR router configured as pppoe server with 2000 active pppoe clients connected with it. I used Mangle to mark there download/upload.

What is more efficient approach for controlling each under bandwidth ?

Dynamic Simple Queue for each user
PCQ base Simple Queues
OR
PCQ base Queues Tree

2

have a look:
https://www.youtube.com/watch?v=loaVBWq6cWA
slides are linked

3

you should add rate limit in their PPPoE Profile, this will create dynamic simple queue as soon as the PPPoE session is established.

4

this was my question.
is dynamic simple queues for each user is better?
or should I mark traffic for different package users,& control them using PCQ base simple queues