I love Boro more than England, but I picked England, as a World Cup win is worth more than a promotion I think. I must have seen 4 boro promotions, and us in 5 finals? Compared to one Euro final. The international stuff is much more elusive, so trumps a promotion to me.
So for me, pick England, win in Qatar and then we would be top or second top of the Champo anyway at Crimbo, under our own steam, and in good stead for promotion.
But, a lot of my choice is also due to belief in the current crop of players, the manager, the chairman, and more importantly our finances heading back in the right direction again (compared to others). So I see boro's promotion as almost inevitable, with Wilder and the current crop which will likely get better before it gets worse.
If England don't win it this year, or at the next one, then I don't think we will get another good or fair chance soon, as the next two are Kane's last chance for me, and I don't see enough goals without him, or in who could replace him before we lose the crop of young talent we have. We need some good centre backs too though.