Curve all the way. BEST... GREATEST... Let's see the Bold . But yeah, the Curve way over the pearl. I want to say the MAIN reason is the keyboard... but I'd say Hand in Hand the keyboard and screen size. I'm with you on this Abercrombie ;).
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I Carry botht ht e phones togetrher, one personal and one work, when it come to emailing Curve rules but in all other aspects i would definitely go for PEARL.
I have both too and I like the pearl for long conversations and when I go out. It took me a week to type fast with Suretype. The curve has a wider screen witch is good for long emails and web surfing but since I have a computer at work the pearl is good for me. I love the size.
As all above have said, the main differences are the keyboard and screen size. The bottom line is, do you want a full keyboard and/or the bigger screen?
I don't have a Curve but I do have a full keyboard 7290. I have to say it 'feels' more pleasureable to type on, despite the fact I'm actually probably slower than I am on my SureType Pearl. I also find the larger screen of my 7290 slightly easier on the eyes, despite the Pearl screen being higher quality. (That will be a double-win with the Curve as it's high quality AND larger.)
Ideally you need to have them in your hands and decide what you prefer.