The Novavax coronavirus vaccine contains an adjuvant which is similar, I believe, to the adjuvant in the Shingrix vaccine. Both adjuvants are saponins. I think that neither the Pfizer nor Moderna vaccine uses an adjuvant. For myself, the Novavax vaccine is one which I would not get due the severe adverse reaction I had to my sole Shingrix shot. I would eagerly get either the Moderna or Pfizer vaccine, however. The high rate of adverse effects from the Shingrix vaccine is thought to be due to the adjuvant it contains.
Here is an interesting article about the development of the Novavax vaccine. It was published by
Science on Nov. 3, 2020, before any covid-19 vaccines had been approved. Also since the article was published, the Sanofi Pasteur phase III vaccine trial, cited in the article as Novavax' chief rival, announced disappointing phase III trial results.
https://www.sciencemag.org/news/202...ompany-end-producing-best-coronavirus-vaccine