Should i buy the iPhone 5s / 6 / 6 plus?

I don't know which one to buy. Help me. Which is better? Does iphone5s lag when the ios 8.0.2 is installed? Because thats what i heard from my friend

If you absolutely want iOS 8, then get a Ipnone 6 or 6 Plus, depending on which size you like best. Do not install iOS 8 on a IPhone 5s as it's not optimized for it.

I prefer 5s, it has everything I need and 6 and 6 plus just seems too big and bulky.

I have the 5s since the ios 8.02 update it went so slow loses Wi-Fi connection takes long time to load a page on safari i ordered the 6 plus my bro has the 6 plus it's just gorgeous way better but 5s is a really good phone love it it's still really fast

I recently switched from the 5c to the 6, might i say it's the same, just more 'newer' and released just now, so of course it's going to have flaws, but i love the 5c much better then the 6