Your question is not clear. Do you want to tell, which version you will upgrade in case of Ubuntu? In my case, I'm having Ubuntu 17.10 in my system now. I will possibly will not dist-upgrade from 17.10 to 18.04 which is a LTS version, soon to be released. Because, for LTS versions, it is long term support and I would keep my /home partition intact and format the root (/) partition and install 18.04 using a Live USB.
Ok i will ask differently If new build is released u wait to update build number like 17.10.x or wait few months or just install it right away
If the current version is running well, I leave it alone for a while. [ If it aint broken, don`t fix it. Why upgrade, if you are happy with it, and if it works well? Let others be the Guinea pigs.. If m$ users had had this wisdom, they would now all still be on w7, or xp.without having had the PITA that was w8, or w10 ] Just my two cents.
Speaking of the *buntus, I'd say wait until the second 'refresh' of the LTS. Better yet, as nodnar said keep the one that works until it is cold and dead unless you just like tinkering, like I do. Example: Ubuntu 16.04, Xubuntu 16.04, Mint 18 (16.04 based) first release of the newest LTS = skip it and let others suffer the bugs. Then when 16.04.1+ came out, it was pretty solid. Same with the current *buntu 18.04, Mint 19. Wait until 18.04.1+ or Mint 19.1+. Then I stay with the current refresh, 16.0.4.4, 18.0.4.x etc. As for the short term ones, 17.xx.x, I would not bother unless it happens to add/fix something you absolutely need. I've always found them to be even more buggy anyway.