Should I get iPhone 6 or 5s?

So I was going to get the 6 but I heard someone say the 6 is laggy due to the ios update or something?

I haven't had an iPhone before so it'd be good to hear the opinion of someone who has had both phones

Ya it was true that ios 8 was laggy but the new update iOS 8.1 has fixed all the bugs so you should go for a new model

The iPhone 6 has a faster processor than the 5s, and therefore is faster; iOS 8.1 is available on both devices, and fixes many of the lag problems that were in 8.0.

Don't know where "someone" gets their info. There's no lag issue on iOS 8 let alone any previous version of it.