Verified answer

It depends. All of those three phones are really nice. It's really more of a personal opinion and what fits your needs.

The Samsung Galaxy S phones (Galaxy S is a series of phones) usually have a 4-inch AMOLED touchscreen which are great. They are more vivid than most other touchscreens. They also use Android OS (the latest one is Gingerbread (2.3) although only the new Nexus S is officially using that, all other phones for now are on Froyo (2.2)) which is a very nice OS. It uses the Android Market which has around 100,000 apps and counting. The only difference between these phones from other Android devices is they are skinned with Samsung's theme along with the hardware differences (by that I mean physical differences of the phone). I find Samsung's theme a bit kid-oriented compared to the stock one. Also most Samsung Galaxy S devices feature a plastic build, which make it very light but also have a cheap feeling along with it.

The HTC Desire Z (The G2) is also an Android phone although it gives you the the stock Android experience (which is a good thing). No themes or whatever. Also uses the Android Market. Only difference is it's made by HTC, has a more metallic feel to it, and features a sliding keyboard although it's a bit thicker. It's also heavier and such.

The Blackberry Bold 9780 on the other hand, feature RIM's newest OS which is OS 6. It features the same internals as the Blackberry Torch (The 624MHz processor and 512MB of RAM) while being housed in the traditional Blackberry Bold casing. No touchscreen though, all trackpad and keyboard operated. The trackpad is really nice, the build quality is really superior, it has a very light but durable feeling onto it. Also the keyboard is amazing, one of the best you'll ever try on a mobile device. Still despite those nice perks it comes with some downsides too, the App World does not have as many apps as the Android Market (around 20,000) and it doesn't feature an accelerometer so games that make use of that are not accessible (racing games and such where you turn the device sideways to control). Still it's by far the best trackpad/keyboard based device I've ever used. I like it better than the Blackberry Torch. Another thing is, when you get a Blackberry, you can also make use of the Blackberry Internet Service plan (availability varies depending on network) which pushes all your email in real-time (meaning as soon as you get an email it shows up on your phone). It's a phone more oriented towards business, messaging, rather than fun and games.

By the way Android OS is a very flexible operating system. Most phones using Android OS can be modified several ways by using custom ROMS to use a build of Android from other phones (like an EVO Android build on a Galaxy S). XDA-developers is a huge community dedicated to modding Android and Windows Mobile OS. Let's just say Android is a very customizable operating system. Just keep that in mind. Still customization depends on the phone since some manufacturers put restrictions to restrict modifications however hackers usually break the restrictions soon.

If it was me I'd go with the HTC Desire Z but I really like the Samsung Galaxy S's display.

Samsung Galaxy S devices include the Captivate (for AT&T), Vibrant (for T-Mobile), and the Galaxy Tab (for all four carriers).

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