Well… if we’re going to embrace the logic above : Groton is fascinated with you and the other two schools are not .
Celebrate your acceptance to Groton ( it’s a big deal - congrats! ) and move on.
There is no decision or choice to be made here unless you want to see either waitlist through to the bitter end and call after deadlines for accepted students or wait until they officially shutdown the WL via a mass email notification - which can happen at ANY moment- especially with PA and PE.
The good news : Both schools usually put WL students out of their misery pretty fast.
All the best and good luck. 