I prefer staying on older and more mature platforms. 11.40 is still "developing" meaning that there's this new feature, then this new feature, woops that breaks that feature. Update, update, update.
I'm not meaning to be negative of the development process, it has to happen. You have to find the problems in order to fix the problems.
But by the same token, why do you allow 11.36 and 11.38 to still be available and supported through LTS releases, if you don't expect people to use them?
I would rather have a stable product over a feature rich product, but that's just me.
(One of these days I will upgrade to 11.40 and I will be forever grateful to all of the good folks that tried it, tested it, found bugs, and fixed the bugs).