IPhone 4, LG Expo or Samsung Captivate?

Im undecided on which one of these 3 phones to upgrade to..each one has things that I like and dislike..Im looking for a phone with cool features that I can also use as a business phone. I also need one thats good with texting since i do alot of it! haha.. & good camera since I usually use it to take pictures of my work and then post on my website.
Does any one have these phones that can tell me pros and cons or which one is better??