Nokia 8 Sirocco is almost 10,000 bucks costlier than Nokia 7 Plus. However, the difference is features in not that much to justify the extra cost. Nokia 8 Sirocco has a QHD Display, a bit faster processor and 100% more storage. While on the other hand, Nokia 7 Plus has a higher resolution front camera and bigger battery capacity.
I would personally recommend going with Nokia 7 Plus, it has got all the necessary features that you might require.
You can see detailed specs here: Nokia 7 Plus vs Nokia 8 Sirocco
Nokia 8 comes with Dual Groove Speaker Grill at the bottom edge of the device.
The output sound of the device is quite great .However, there is no claim by the company regarding the speaker being from the Dolby.
In the meantime, do not forget to find all the detailed specifications and other latest update regarding the Nokia 8 here.
yes, the Nokia 8 Sirocco does have a stock Android and that is because it comes with the Android One Custom UI.
The Nokia 8 Sirocco is quite a little old phone now but with the Android One, it still updates to latest Android.
Check Full Specifications Nokia 8 Sirocco