I mean I think Philadelphia is the easiest opponent of those four, so in the interest of winning, I'd take them.
In the interest of revenge, Boston is obviously the number one choice, and after them, Washington (given the 2017 matchup).
No reason to face Tampa Bay. In my mind they are the best team of the lot, and we've got nothing to prove against them...although I do like how we matchup against them, stylistically, so it might not be a horrible matchup for us.
No matter who we face (if we get past Columbus, which is anything but guaranteed), it will be a tough series though.