Top 4, both Manchester clubs, Chelsea and Liverpool are probably the biggest favorites. if we count some very awkward teams like Leicester, West Ham, Tottenham, Wolves, every team from the top 4 will have +/- 14 (Home/away) difficult games. It’s just hard to expect someone to make an unbeatable series here.
Plus, they participate in CL where they will have some more complicated games. I still don't see a clear favourite here.
West Ham have made good additions as of recent, however prior to that I didn't see them as much of a threat for top 4, and I probably still don't. I'm not doubting their first team, what I am doubting is their qualification for Europa League, and how that is going to effect things. I do believe they'll struggle to repeat what they did last season, despite having a decent start to the season.
If I was going to make a prediction for top 4 now that some of the clubs have made their transfers:
Chelsea
Manchester United
Manchester City
Liverpool
I'd obviously love to put Liverpool higher, but our depth isn't fantastic if we get any injuries. It's basically the opposite to what it was last season, where our defense was running thin, now we are a injury away from having to play Origi up front. In fact, Firminho picked up a muscle injury in the game against Chelsea.
I'd agree with Chelsea being the favorites but only slightly, However, they'd need to beat City at their long term consistency to win the league, a slightly over average performance all season wouldn't do it, they have to be on their toes all season long, and Liverpool would also be keeping a really close tab as well, It's really going to be a competitive league this season, I'd say... I really don't see Man Utd in the picture when the season started, and I'm afraid the addition of Ronaldo doesn't change my perspective, yet.
The reason I'm going for Chelsea is not completely down to their first team, but their strength in depth. That's what wins you titles, and it's one of the biggest reasons Manchester City have been able to consistently put up a challenge to defend their titles back to back. Liverpool, and Manchester Untied to an extent can't afford any injuries to certain positions. In fact, I'd argue that Manchester City hasn't got adequate cover for striker. Chelsea are the most complete team in the Premier League currently.