Use Semi and you won't worry about the dirt or grit near as much.
Chisel chain is a roller coaster of speed. Its the fastest and then shortly there after its the slowest to the point of just plain ole stopping in the cut.
Semi-Chisel isn't the fastest and it isn't the slowest when dull, and it takes a lot longer to get from one extreme to the next with semi, as it has a much longer working life.
With Chisel chain the corners get broke/worn off and then you get to spend the next 5 minutes filing 1/16" of your cutters completely off just to get a fresh edge. You have to hit nails or horseshoes to ever see this with Semi-Chisel.
In my opinion, if you want to think you are really fast and cutting a lot of wood, fool yourself into "feeling that" with Chisel chain.
But if you really want to actually cut a lot more wood at the end of the day or week, then use Semi Chisel, as you can spend a lot more time doing productive cutting and less time fooling around with chain sharpening procedures.
There is a phrase in production and it goes, "Slower is faster" and this is a case where the "slower" semi-chisel chain will out cut/cut more wood than the faster chisel chain, as long you are aren't starting and stopping within seconds or cutting cookies with a stop watch, then you should really like the benefits of Semi Chisel.
I personally will only purchase and use Stihl Full Skip, Semi-Chisel chain. I spend more time cutting and less time sharpening.
Sam