Been jailbreaking my devices since the first iPod Touch (which is almost 8 years ago)
and I must say I cant live without one anymore. So much tweaks and customizations to make your iPhone the best one.
to Itsme, the size of the store doesnt really matter. you only see about 30% off it, you have no idea how many asian apps there are, incl all kinds of bullshit apps no-one wants. And the customization part, youre right, without a jailbreak you can customize for more easier on an android then on iOS.