Best card for calls from Germany to USA?

[eurouser]

I have already purchased the solomo card, so I think I will stick with it this time. But I am happy to learn of other alternatives since I travel to Germany at least once a year. It would be nice if I didn't have to switch between to cards to get the best rates in both directions. Right now I have to keep the Yackie card in the phone for incoming calls and switch to the solomo for outgoing. This gives me the best rate (adding costs to caller and called number) I have found so far and gives me one number I can give out for incoming calls.