As ever, the answer to such a question would start with "It depends..." In another discussion in this forum, [NAME] gave me an answer - [NAME]  Dell BIOS Change Logs S***S  They do not provide complete information, I have dealt with their technical support hundreds of time and when a NEW bios was released to fix a certain issue but that information was never made public. Same as Microsoft a windows update KB Change log is always this and that improvement and real thing is never shown.   For you my suggestion : Do not fix something which isn't broken. I am running 2016 BIOS on my gigabyte motherboard without any issues. Gigabyte has released over 12 updates in last 5 years. [URL]#M88926 I'll go with that.
I just noticed that a new BIOS version 1.0.9 was posted today August 27. The driver details page on the website notes this for fixes and enhancements with this release: Fixes:- Fixed the issue where the external monitor displays a distorted Dell logo when you turn on the system with the lid closed. Enhancements:- Supports Realtek RTL8153DD-CG Ethernet Interface Controller.- Improved the system stability. [URL]  My 9305 has BIOS 1.0.8 released in May. I haven't experienced the issue with the external monitor. For enhancements I don't use an Ethernet connection only wifi. If I knew what was behind 'Improved the system stability', that would be helpful! Is it worth updating the BIOS?
XPS 13 9305 new BIOS 1.0.9