IRS vs. 4-link, aka: RS vs DSE...

[The T-man]

I'm trying to decide between the RS IRS setup
and the DSE Quadralink...

I want a smooth, compliant ride 90% of the time
with the ability to make some changes for weekend track rides.
Sort of a "best of both worlds" if possible.

My builder says the DSE is the proven setup, etc...

any thoughts, feedback from those who've used or rode in a vehicle with these>?