For years certain sections of the media have told us that a 3.5" screen was the correct size, anything smaller was "tiny" anything larger was ridiculously large, remember the guffaws when the Desire HD was released? In reality a 4.7" screen is absolutely fine unless you're a hobbit.
All the major phones/software have drawbacks
Android can be a bit flakey and is fragmented across devices plus you get Google and a lot of apps spying on your every action - naff off Google
iPhone - weirdly for the standard bearers and democratisers of smart phones they seem a touch old fashioned, maybe a bit rudderless since SJ karked it. Yes it all works (except the laughable maps) but you have to do things the Apple way, oh and of course the Apple tax. I don't really get the form factor change either - what does it add, seems small these days.
Windows - well WP8 - all looks fresh seems to get good reviews but limited and expensive hardware, small ap store, currently only shipping about 3% of all smart phones (although more in UK) - are windows as "spy-ey" as Google dunno.
Blackberry - dunno never really used one, all the teens love em.
In your situation an LTE iP5 seems the easy choice to make, there really isn't anything much you're missing out on with Android other than big screens and customisation, depends how much you like to fiddle
Personally got a Nexus 4 which seems ok and a dirt cheap sim, I'll look at getting a Ubuntu or Mozilla phone when the Nexus gets tired.