Go with 32GB.

32GB, hands down.

Content creation eats RAM. Video editing, large Photoshop files, After Effects — all of them love memory. 16GB fills up fast, and when it does, your system starts swapping to disk. That slowdown is way worse than the small speed loss from slower memory.

The difference between 2133MHz and 3200MHz is real in synthetic benchmarks. But in real work, the benefits are marginal — maybe 5-10% in CPU-limited tasks. Running out of RAM can cut your performance in half or more. Capacity always wins for productivity.

If you were building a gaming rig, I’d lean the other way. But for a workstation, more memory is the right bet.