windows 10 or windows 11 for latitude 7400 i5 gen 8th and 16GB Ram,ssd 256GB ?

Latitude 7400 supports either Windows 10 or Windows 11.  With the system listed configurations and for a permanent solution, use Windows 11 as Microsoft will end support for Windows 10 next year, in October 2025.

@Chino de Oro​ thank you so much for that i was just wondering of that as windows 11 still got some bugs and someone advised me to stay on windows 10 as it's more stable but it's okay thanks for your help <3

From my personal experience, Windows 11 is very stable.  Because the core operation of Windows 11 and Windows 10 are the same.  But the visual and layout are more vibrant.  Also, everyone's personal preference is different.  My usual suggestion is, installing Windows 11 to a spare drive and testing it out for yourself to see if you like it.  Tweak it to your preference and test it out for a week, a month.  If you don't like it, or can't get used to with it, just simply swap the original drive back and your system will be the same as before.