Amazingly, I do have plenty of experience with both.
I had the Env2 for about 3 weeks. But I never made a review for it. I did a review for the phone I replaced it with, the Voyager.
Env2 is nice but ultimately I dont think you'll be happy with it. Relatively poor battery life for one thing. Also, that tiny external screen and mediocre internal screen might seem OK now, but eventually you will want more, even if its just a texting phone. Also, it has been known to get system errors and need to be replaced. The Voyager is even worse. And after about 3 days I got tired of flipping it open all the time. Trust me, damn near anytime you wanna do ANYTHING with it, you'll be flipping the Env2 open. It gets irritating after a while.
Voice quality is also below average. The battery I had didnt seem to last very long, even when not in use. I never did feel like spending the extra money for a bigger one. However, I have been told that newer versions with better quality parts and later firmware improved on this.
Along those lines: Its a relatively old phone and the Env3, Env Touch, Neon and Xenon are all replacing it and they are all much better devices, whether you intend to talk or text.
I HIGHLY recommend the Blackberry Curve to anyone, even folks who dont think they need that much phone. Everything is superior on it, and you wont be flipping it open all the time. Much easier to get extended batteries and the default battery is far better compared to most phones. And believe me, you wont just use it for texting when you see how nice it is. You'll wanna do other stuff too, I promise.
The only downside to a Curve is the unit price and monthly plan. You will certainly spend more money on it, but overall you'll be much happier.