What punishment should i choose?

hi im a guy in his 30,s and i met my wife in lets say a specialist club of doms and subs, me being the sub.it has been heaven for me to be her slave it just works out great for us two, but recently she found out id been seeing another dom now i have to be punished.She is inviting her family and friends round this weekend and ive got a choice of punishments either a bare bottom over her knee in front of everyone or come downstairs where everyone will be in a dress,tights and heels dont want to do either any ideas guys and girls please