Solid axle > IRS at the track
And that isn't just my opinion.
I think there might be a different section on the board for making your car ride smooth on the road.
I said in my original post that the SRA would be better if he's going to run at the track a lot. But if the track is going to be a once in a while thing to keep the IRS. You said the SRA is better all around. I was pointing out that's your opinion. Not everyone shares it.
Because it's bad to have a car that rides good and handles well.