Streetdeck nav is...not good. If Nav is important to you, go with something else.
Bluetooth phone on SD is under development, in beta, but the release date is....uncertain.
If you like Roadrunner already, stick with it. I am sticking with SD for three reasons. 1. Hope that they will get all the problems worked out. 2. I already spent the money on it. and 3. It's relatively easy to make the interface look exactly like I want it, which is important to me.