Should I use a dynamicbuffer or AddComponent?

[small quartz]

I'm trying to learn DOTS and I want to make like an RTS game to figure it out. I want to grab a list of all units selected by the player so that I can edit their targetPos variable.

I know it has some performance effects if I use AddComponent to add a selected tag, so should I make a singleton buffer of all selected objects? I just want to know what the best coding practice is here.

[turbid rivet]

AddComponent will cause bad performance when:

• used constantly without restraint
• tanks the running jobs
  So if you plan it well it isn't that bad. You just have to understand what it does and its effects on the ECS world.

Because you're exploring ECS, my suggestion is experimenting with both approaches to understand pros/cons of each one for a particular situation.