Kind of torn and need your opinions. So I am making a pound cake layer cake with pistachio pastry cream and raspberry jame fillings. Should I do a Vanilla Bean Russian Buttercream or a Stabilized Whipped Cream Frosting? Thanks for your input

Both sound reasonable. Russian buttercream more in the sweet side. I will make the decision based on the weather. Buttercream will be more resilient in harsh conditions. 

Thanks. We are staying indoors, so not an issue. 

Then balance on color palette, as the buttercream is more yellowish tone. Also consider price, since buttercream is more expensive and labor intensive. And finally, consider if you really want/need to achieve a smooth finish and glamorous piping... In that case, the buttercream is on your side. Hope that helps!

Thanks so much