Hard to say. Nobody ever wins, it's just a question of getting most MPs, and whether that's enough to be more than half so that party can be a majority government as opposed to a minority government or trying to go for a coalition.
And what happens in a general election tends to be very different from any other election, because then the people think "uh oh, this is the real thing, who do I want to be actually in charge?" The Brexit Party got most votes in the Euro-election last month, but everyone treats that as a mere protest vote and over half the voters didn't vote anyway. Far more people vote in general elections and it's a totally different voting system, so opinion polls are less relevant in general elections.
My guess is another Conservative minority government or Conservative-dominated coalition. Reasons:
a) Labour have always been reliant on Scottish seats but now the SNP gets most of those, they can't win
b) the Conservatives will always look like a safe pair of hands in England and that's where the vast majority of the voters are
c) Labour has gone madly socialist again under Corbyn, McDonnell, Thornberry and the Abbacus so all the rural and suburban English constituencies will go Conservative to keep them out. I well remember the 1980s... people hated Thatcher but then they looked at Labour and went GAAAHHHH! The party had gone so far communist that Gerald Kaufman was right in describing its 1983 election manifesto as the longest suicide note in history. Labour only became electable again after it chose Tony Blair to lead, because he looked nice and cuddly and kind of Tory-lite.