I'm in a similar boat. Pro's and cons are pretty similar imho.
We stayed on offsite staff camping last year, and these are a few we walked past as part of stewarding or on our way to the site. They looked nice but I don't think the price is worth it.... most are really silly money for those who find money no object.
https://glastonburyretreat.co.uk/book-now/ (food included in the price, but... food is one of the main draws of glastonbury imho)