It depends.

SAS from/to CPH is certainly one of the lower-risk options. It's Schengen-to-Schengen. They don't have a base in Frankfurt. SK1635 has a good number of people connecting to the last wave of long-hauls out of FRA: GIG, BKK, SIN, JNB, GRU, CPT, HKG, and EZE. Except for HKG, those destinations don't have non-stop service out of CPH by SK. So again, SK1635 is really a feeder flight to a large extent.

It does get a gate positon a vast percentage of the time. SK also cannot run some of the games on you which LH sometimes is liable for (e.g., with LH, you might be coming in on a Schengen flight and receive a gate position, but still have to take a bus as the aircraft's next flight is a non-Schengen one).