Recommended Linux version on Ubuntu-Server

Hi,

There are two Ubuntu-Server versions on official download page for Rock Pi 4B. One is Linux 4.4, while another is Linux 5.1.

Which version is recommended for commercial products? Or it doesn’t matter that much?

Linux 4.4 seems to boot 20 seconds faster than Linux 5.1(according to this discussion), that’s why we are considering to switch to 4.4 instead of 5.1. But because it is an older version, we are not very sure.

Would appreciate any feedback.