Ok .. "IdeaBlade has the lower learning curve".
Seriously, RIA Services (RIAS) is an important initiative for Microsoft and we expect a first-class community to grow around it ... when it emerges from CTP. It's a moving target right now so TODAY we might be easier to learn simply because we have a big head start.
I expect this to change. The Microsoft folks care a lot about adoption and ease of use. They are big and they close fast.
I can't tell you if you will find us easier to learn or RIAS easier to learn. So much depends upon who you are, your background, and the features that you value. While you're thinking about ease-of-learning, you'll also want to focus on where you need to be when you deliver your application ... not just where you are at the start. And our bias should be obvious and expected.
I can't speak for RIAS ... and wouldn't if I could. I can speak for our commitment to ease-of-learning and ease-of-use.
We think these principles are critical to our present and long-term success and are investing continually in features, training materials, and support to improve your experience. We're proud of our Object Mapper and the way your DevForce business model is the same on server and client; full LINQ on the client should make your code more natural and easy to follow; we think these things contribute hugely to your ability to learn and maintain your application.
We've been at this a long time. We're easy to reach.
Just remember : RIAS is a tiny piece of Microsoft business; DevForce is our business. We are "all in".
Give us a try.