I don’t think there’s much of difference except maybe how it works best for you results wise or schedule wise. I started at 16-8 but wasn’t seeing much progress so switched to 18-6. I had good progress at 18-6 but then sort of slipped to 17-7 because it worked well with my schedule. Now it varies by day but generally falls somewhere between all those numbers. I think everyone plays with it a little til they find their own sweet spot. I have read that 16-8 is the minimum though so maybe start there and adjust as needed.
I always end up doing the odd numbers like 17:7 and 19:5. I initially started with 16:8. Yeah, I think it’s easier to remember the even numbers lol. I think as long as you fast for a minimum of 16 hours then you’re doing good. People fast longer when in plateaue, but no particular reason to have it be in odd or even numbers
I do something similar quite often, with only a small tweak. I’ll go 17 hours and break, with the meal I eat sometimes being the only “food” I eat. The rest of the time is drinking beverages that would be considered fast breaking so I don’t restart until the window is actually closed.