I have a Savanna 2 jacket. It's a great jacket, especially in the summer. Ventilation is fantastic, though you have to be moving to get the benefits.
The downside to this is the waterproofness. It's not, unless you get the gore tex insert. Then it's fully waterproof. But because you wear the waterproof insert on the inside, if it rains while you are wearing just a t-shirt (i.e. bare arms under the jacket), the insert sticks to your skin, and can cool off very quickly. The jacket is made of a very coarse weave, so is highly permeable to rain. It rains right through the jacket.
The other thing is that it is not a warm winter jacket. I am wearing it through the winter, but I have to dress carefully (several layers, with a windstopper fleece) to ensure that I stay warm. I wouldn't want to ride all day in sub-zero temperatures without a heated vest.
However, we can't rule out me being a big girl's blouse on this one.
I have no experience with the Rallye II jacket. I looked at it, as I could have chosen either one. In the end, I liked the look and feel of the Savanna II jacket better. I suspect that a Rallye II jacket would have more or less the same issues with waterproofness and warmth.
David