Best way to migrate from old Macbook pro to new one?
So I got a 2015 Macbook Pro yesterday, realised I hadn't backed up my old one with Time Machine so did that for the first time. Because it took pretty much an entire day (and I'm impatient), I went through setup on my new laptop and played around with it a bit.
Then today I used Migration Assistant to transfer my stuff over from the Airport Time Capsule to my new macbook but it's been going for 4 hours already and it's about an 8th of the way through. (It's estimating 8 hours but I changes every few minutes).
It there a faster way to do this? I don't have any thunderbolt cables & don't really want to spend £30 on one. I have an external hard drive so would it be quicker to backup my old macbook to that and then transfer it to my new one? and, this might be a stupid question, but is there a way to connect the Time Capsule to my new macbook and migrate that way? as in through a cable or something?
ALSO, if i stop the migration on my new macbook will it mess it up? There's really nothing on it, so is there a way to restore it to factory settings?
If this helps the old macbook is using Yosemite 10.10.2 and the new one is probably using the newest version.
MacBook Pro with Retina display, OS X Yosemite (10.10.3)