Fable 5.1 is much better at system design than Opus 5.5

Fable 5.1 is still goated when it comes to system design. It seems to consider the outcomes that will happen in the future for the decisions it is making now. Which is really important in system design. It nails that part. Opus 5.5 is really good. But as a executor. Not planner. If I have to debug a hard problem and design something I will work on long term then fable will be no brainer for me. Opus as implementing the plan.