Who will win the Champions Trophy 2017 ?

Giving a specific answer to this question is quite difficult. No matter how strong a team you are, if you don’t perform on the day, you are gone.
I will refrain myself from predicting the winner of the tournament but I can give you an analysis of all four semifinalist on this turnament. Decide for yourself the winner of Champions Trophy 2017.

England:
To be honest, this probably is there best chance to win their first 50 over ICC tournament. The biggest advantage will be the English conditions which will play a vital role in the tournament. They bat deep down the order with some powerhouses like Ben Stokes and Jos Butler. In the form of Liam Plunkett and Woods, they have some really good middle over bowlers.
The main point of worry for the English side would be their ability to come together as a team. They have often failed to play together as a unit. Lack of quality spin is also a point of worry.
Key Player: BEN STOKES

Pakistan:
While they may not have big stars in their batting line-up, it still looks stable with the presence of Ahmed Shehzad, Azhar Ali Babar Azam and the skipper Sarfaraz Ahmed himself. Mohammed Hafeez and Shoaib Malik's experience only makes it better.
It’s quite difficult to accept this, but the biggest weakness of Pakistan in this tournament is going to be there pace bowling attack. Except for Riaz and Amir, I cannot see any other bowler capable of making an impact in England.
The inexperience in the team can cause them a trouble if caught in nerve holding situation.
Key Player: Mohammad Amir

Bangladesh:
Having beaten teams like New Zealand and Sri Lanka this year, Bangladesh come in with a sense of confidence. Their batting line-up resembles quality and is fairly settled now. Tamim Iqbal is an explosive and experienced opener, and Shakib Al Hasan tops the all-rounder rankings in both Tests and one-day internationals. Left-arm quick Mustafizur Rahman is one of the most exciting talents around.
As the warm-up game against Pakistan showed, Bangladesh's bowling attack doesn't quite match up to their batting. Even a total of 341 couldn't be defended by them, and that should be worrying. The batsman cannot handle mental pressure.
Key Player: MUSTAFIZUR RAHMAN

India:
Going in as one of the favourites, India has never looked so threatening with the ball before. They have a lot of a variety in their pace bowling from the new ball swing bowlers to death over specialists along with some top class spinners in Ravindra Jadeja and R Ashwin.Their batting line-up, led by the irrepressible genius of Virat Kohli, is capable of chasing down any score put on the board.
There only point of worry would be the form of India’s two pillars in the middle order, Yuvraj Singh and MS Dhoni. However, as they say, form is temporary and class in permanent. It is just a matter of time when they start threatening the opposition bowlers again.
Key Player: VIRAT KOHLI and JASPRIT BUMRAH

After looking into all the teams, India and England looks the strongest on paper. They have quality batsmen, threatening pace attack, attacking all rounders and magic weaving spinners.
Nothing could be said, but going by the team combinations, these are my picks for the tournament.