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Adelboden-Lenk and Gstaad are different choices for a ski day from Lake Thun. In Adelboden-Lenk, the open links and your skiing ability decide how far you roam. On the Gstaad side, Zweisimmen gives access to Rinderberg, with connections towards Saanersloch and Horneggli when conditions allow.
Choose one area and allow time to enjoy it. These names do not describe a single continuous ski network. Check the precise access lift, current snow report and return before buying: nearby subareas can open on different dates. Rental, lessons and a suitable beginner area also need their own arrangements.