I have gone with Niall. I think he has surprised people with his sound and also success so far. He seems to be building his solo career slowly.

 

So far, they have all done had their own success, Louis could be a surprise if the next single does well for him. I would believe Zayn has peaked with his debut album and i cant see any future albums by him doing any better.

 

I really think it will be interesting to see how the debut albums by Niall, Louis and Liam perform as it would give indications to how their solo material has really been received.Harry's debut has done well, but, it is falling down the charts rapidly and his sales could potentially be beaten by the named 3.

 

 

I do think Niall is going to have an Ella Eyre style career, however if he plays his cards right he could do a Paloma Faith?

It's definitely between Niall & Liam.

 

Zayn is pretty much done. He might have one or 2 more Silver singles and that's about it.

 

Harry might surprise with his second album, definitely nothing hit worthy left on his current album.

 

Louis......well, I don't really expect anything from him.

In terms of hit singles, you're likely all correct to say Zayn is burning out, so to speak. But I think he'll continue to be a solo presence for a while now, just in a more underground sense. He's been on tracks with Chris Brown and M.I.A but now so I feel like he's quite respected in the industry in a way that is seperated from just being a hit machine from a big boyband. I think he could stick around in a way, maybe like a Solange-type, that is well respected within the RnB genre and puts out songs of great quality that aren't necessarily designed for the mainstream but are well perceived critically.