Use them both in the store. Compare everything side by side, contacts, sms, email, everything. I have owned just about every android device for tmobile, at&t, and now verizon and I can not say enough about the Inc. The Sense UI just makes the phone in my opinion. It fills in the gaps in Android OS and really polishes and finishes it. If the Fascinate was able or came with Sense, I would choose it in a heart beat just for the bigger screen. That is the only draw back I have from the inc, its hard to type on. Either way, welcome to Android and enjoy.