Did you know that you can connect your iPhone to 2 Bluetooth speaker at once. I’m not able to stream to both speaker at once. I’m on 11.1 maybe it’s possible with iOS 11.3 with AirPlay 2 feature
I asked about this at reddit and in the 11.3 beta thread, but nobody answered. Dual Audio (like Samsung) would be a big reason for me to upgrade my iPhone/iPad this year.