I actually just went through this debate for myself, and the main reason I wanted an XPRT was the fact that it's a world phone. I spend several months of the year out of the country, so I need a GSM phone. I bought the Droid pro about 6 months ago, which I've been using, so I thought it would be nice to get an XPRT and just have one phone that I use all the time, rather than a Verizon world phone and a Sprint phone for home.
I ended up with a Replenish because I got a good deal on it, though. My comparison is based off the Pro, but it's the same phone as the XPRT, so the comparison should still apply. The XPRT is certainly faster than the Pro. It's not a gaming phone, per se, because of it's form factor, but it certainly has the power to handle games just fine. I'd say the XPRT is much more of a workhorse than the Replenish is, without a doubt. What's kind of sad is that the battery life on both is about the same. I haven't flashed the new ROM onto the Replenish yet, but the battery life is horrible with the stock ROM. The XPRT has the better camera for sure, although I hardly ever use phone cameras, so I don't care. The screen is much better on the XPRT, too. I'm getting used to the Replenish screen, though, so again, I don't really care.
The Replenish is faster than my Transform, though, which has me very happy, and most importantly, it has a good keyboard. There are aspects of both the Replenish keyboard and the XPRT keyboard that I like, and aspects on both that I don't like. I don't like the feel of the XPRT keyboard, but tons of people do because it's exactly like a Blackberry keyboard. I came from using Treos for a few years before I switched to Android, so I prefer the more bubble-shaped keys of the Replenish. I like the directional pad that the Replenish has, but I wish the Shift and the Function keys were switched, and I wish the period and the comma weren't on opposite sides of the space key. Personally, I could do without a voice key and would rather have a longer space button, but voice to text is the future of mobile devices, apparently, so I know that's not going anywhere soon.