My personal observations since becoming a VJ member in 2016:
Number of VJ members who later regretted choosing a K-1 over a spousal visa: Many
Number of VJ members who later regretted choosing a spousal visa over a K-1- None
That indicates some dissatisfaction, for many, with the K-1 process somewhere along the journey. I would think it is the limbo period after arriving. Couples should consider the advantages and disadvantages over the entire immigration journey.
Life is full of choices....and consequences.