Hi there,
You can find all health insurance policies and premiums in the comprehensive health insurance comparison tool on moneyland.ch.
As you can see on the result page, there are cheaper options from other health insurance providers, but also cheaper health insurance plans by Swica. This is probably due to your selection of a specific health insurance model and/or a more expensive deductible.
The optimal deductible is depending on your estimated health costs in 2018. If you estimate your health costs to be high next year, you should select the CHF 300 deductible, otherwise the highest CHF 2500 deductible. (You can find more on the subject here: health insurance deductibles: Getting it right.)
You can find other important health insurance selection criteria in the following article: Best Swiss health insurance policies compared.
Regarding customer satisfaction, you can find the newest survey data on moneyland.ch (you can even sort the health insurance plans according to different customer satisfaction criteria).
If you want to switch to another provider (or health insurance plan), you can do that every year. The insurer must receive your policy cancellation notice before the last business day in November (more information on terminating your Swiss health insurance policy).
Best regards from Moneyguru
Health insurance comparison tool