There are many alternatives although, as Larla says, you have to work for them. In most apps, clicking on a link will open it either in the app's internal browser on in Safari. So if you use an alternative browser you have to copy the link, then paste it in your browser.
I use iCab Mobile for most of my browsing, because it has more functionalities as Safari. For instance I have it set to present itself as Safari for Mac, in order to avoid being routed to crippled mobile sites. Also, I mostly browse the same sites and they are on my "quick links" page. I also use Safari when I follow a link and I'm too lazy to do the copy-paste thing, or for some sites where I have saved the password in Safari. For some reason iCab won't let me do that.
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