Question: Which musician filled more roles in their bands, Vibeke Stene or Wong Ka Kui?

Context paragraphs:
Rock and Roll (Beyond album): Rock and Roll (), is a 1993 album by Hong Kong rock band Beyond.  This was the last album before the band's late vocalist, Wong Ka Kui died after an accident while filming in Japan.

Rubicon (Tristania album): Rubicon is the sixth full-length album by the Norwegian band Tristania.  It is the first Tristania album to feature female Italian vocalist Mariangela Demurtas, who replaced former frontwoman Vibeke Stene.

Illumination (Tristania album): Illumination is the fifth full-length album by the Norwegian band Tristania.  It is the last album to feature Vibeke Stene on vocals, Rune Østerhus on bass, Svein Terje Solvang on guitar, and Kenneth Olsson on drums.  This is also the final album to feature Østen Bergøy as an official member of the band, although he performed some vocal work on the band's next studio album as a session member.

Yip Sai Wing: Yip Sai-wing (born 19 August 1963) is a Hong Kong musician, best known as the drummer and co-founder of the rock band Beyond, formed with the lead vocalist Wong Ka Kui.

Wong Ka Keung: Wong Ka-keung (born 13 November 1964), also known as Steve Wong, is a Hong Kong musician, singer and songwriter.  He is best known as bassist for the rock band Beyond, of which his elder brother Wong Ka Kui is the lead vocalist.

Vibeke Stene: Vibeke Stene (pronounced vee-beh-keh) (born 17 August 1978) is a Norwegian soprano.  She is best known as the former vocalist in the gothic metal band, Tristania.

Ashes (Tristania album): Ashes is the fourth full-length album by the Norwegian band Tristania.  The album registers a change in the band's musical style, leaving out the choirs and initiating a heavier sound, with a focus on darker lyrics and the pure vocals of Vibeke Stene.  This album is the only one Kjetil Ingebrethsen performed harsh vocals on.

Beyond (band): Beyond was a Hong Kong rock band that formed in 1983.  The band became prominent in Hong Kong, Taiwan, Japan, Singapore, Malaysia, Mainland China and Overseas Chinese communities.  The band is widely considered as the most successful and influential Cantonese music group from Hong Kong.  In 1993, the founder of the group Wong Ka Kui died due to an accident while filming a show at Fuji Television in Tokyo.  Beyond continued to perform and record after Wong Ka Kui's death.  In 2005, the remaining members Paul Wong, Wong Ka Keung and Yip Sai Wing decided to pursue their own solo careers, and Beyond officially disbanded.

Wong Ka Kui: Wong Ka-kui (10 June 1962 – 30 June 1993), was a Hong Kong musician, singer and songwriter, best known as the leader and co-founder of the rock band Beyond, for which he was the lead vocalist, rhythm guitarist and main songwriter.  He won a lot of awards from 1988 onward.  The band’s hit songs include "Loving You" (1988), "Truly Love You" (1989), "Amani" (1991), "Boundless Oceans, Vast Skies" (1993) etc.

Tania Stene: Tania Stene (also Tanya Stene, Tanja Stene, Nacht, Nachthexe) is a Norwegian interdisciplinary artist.  She works with different techniques such as oils/acrylics, photography, collage, video, sound and installation.  Originally known as half of the ritual ambient duo Aghast (along with Andréa Nebel), her newer music is more experimental and noisy (collaboration with Alexei Borisov on Fabriksampler V2 - Pharmafabrik Recordings).  She is known for cover art & photo shoots for some of the biggest Norwegian black metal bands in the '90s, including Darkthrone, Ulver, Thorns, Satyricon, Burzum, Emperor and Sunn O))) live album.  Tania Stene used to be married to Fenriz (Darkthrone).  She is also known for her cover art of "Bergtatt", "Nattens Madrigal" and "Hliðskjálf", and for official photo shoots of Isengard and Thorns.

Supporting paragraphs: Vibeke Stene Wong Ka Kui
Answer: Wong Ka-kui