Law: McGill v Kings College London

I have offer from both KCL and McGill for Master’s in Dispute Resolution (arbitration). My future plan is to conduct my PhD also in the same college. I am inclined towards McGill due to fees but both McGill and KCL has reputed Law Faculty especially in Dispute Resolution (arbitration). However, KCL is in London and has higher rating. I do not know much about McGill’s prestige in law around the globe.