Minny would be pretty dumb to do the GSW deal over Boston's.
With GSW trade they get a high salary Lee for 2 more year , both Barnes and Thompson will need to be signed to big long term deals soon, and they will be to good to get a top lottery pick, but not good enough to make the playoffs. They would basically be putting their team in a state of mediocrity (7-10 seed in west at best). No big time free agent is going to Minny to play with Barnes and Thompson, and no high lottery talent would be able to be added to that core.
With Boston deal they get #6 and 17 in a deep draft, who would be on cheap rookie deals for the next 4 years. They get an additional pick or 2 as future talent or trade chips . They get Sully who is still on a rookie deal for 2 more years, and likely won't require they pay day that Thompson and Barnes will likely get . C's can also help Minny cut more salary by taking back Martin for Bogans' contract .
Minny would also be getting another top 5-10 pick next year ( their own) if they do the C's deal .
so would you rather have two high lottery picks , a starting PF (who's only 22 and on a rookie deal) and an additional future pick or 2 , and the ability to shed another long term contract (Martin )
or
Take on Barnes, Thompson as your future core ?