I currently own an Optiplex 3050 Micro. I'm using it as a 24/7 as a private server for OwnCloud and other  server tasks. It serves me well and I'm happy with it, except I had to relocate the PC to the living room. The fan is silent compared to e.g. a NUC, but in a totally silent environment it can be nerving when you want to take a nap or sleep (our living room is also our guest room). 

Long story short, I've an option to get a Optiplex 5070 SFF. The SFF would still fit into the location where the 3050 Micro is at the moment. Therefore I wonder if the 5070 with the i5-9500 and the larger fan compared to  the Micro has a more silent fan noise floor. 

Do you have experience with both SFF and Micro and can compare the fan noise between the two?