Sanchez, Lukaku or Morata? your pick!

Let's say, Diego Costa finally leaves this summer, which of these players would lead the Chelsea attack and link up better with Hazard and Pedro/Willian in our 3-4-3 system ?
Sanchez, Lukaku or Morata?
For me...Sanchez all the way!
Sanchez would suit and link up better with Hazard and Pedro/Willian in attack, especially when we counter!
The pace will be devastating and ruthless in front of goal!

Sanchez has proven that he's a capable goal scorer.
Yes: he lacks height, but he makes up for it with his pace and skills.
Take a minute: imagine the pace when they all combine.

Lukaku is strong physically, and a proven goalscorer!
He's a good option upfront for a slightly different strategy
If the strategy is based on muscling out defenders and scoring goals, then Lukaku fits the bill.

Morata I think will be a gamble.
Yeah, the same cliche: 'he's not proven in the Premier League' comes to mind.
However, some foreign players have adapted and impressed well in their first seasons.
Who's your pick?
I'd go for Sanchez!