For those that are hooked into Google services already and don't necessarily like the built-in Safari browser, Chrome may be a better option than for both iOS and Mac. Not only does Google sync your bookmarks and web history, just like Safari offers via iCloud, Google can show you what web pages you have open on any instance of Chrome you're currently signed in to. Left a page open on your Mac that you need to get to on your iPhone? No problem, just check your open tabs and pull the page in question right up. Google Chrome also ties in nicely with all of Google's other iOS apps.
Safari for Mac supports a plethora of browser extensions and plugins from password managers to Facebook status updaters. No matter what kind of plugin you need, you'll most likely find one for Chrome. And for times you don't want someone snooping around your browser activity, there's Incognito Mode, available for both iOS and OS X. Google Voice also allows you to search the web on your iPhone or iPad using only your voice, a feature comparable to built-in Siri capabilities.
Google Chrome is available for free for iPhone, iPad, and Mac. You can download them now via the links below.