Gripens were deemed the worst of the 3 options for the Swiss Airforce, not making minimum requirements in any category. Rafaele's are the best, according to the Swiss, but I don't know if they have arctic clearance.They should keep F-15's in the arctic and borders for quick scramble intercepts. It's the fastest and quickest rate of climb and it's service ceiling and record is unparalleled. It's the only plane that can intercept high altitude Russian bombers without firing on them from miles under.
Gripens should patrol outer airspace and Typhoons or Raphaels should be 2nd layer scramble.
I see no need for F-18's, and certainly not F-35's.