LS 6.x just came out this week. I would rather wait a couple of weeks to install it on a production environment. In the meanwhile I would run it in an test environment and see how it does.
At the beginning of a new version, there can always smaller or bigger "hickups", so I'd rather upgrade to LS5 which seems to be rather stable and see how LS 6 develops, but that is just my personal opinion,. of course.
Keep in mind that both, LS5 and LS6 will not work with your templates and most probably workarounds from LS3.
+1 for all at an exception : 3.X and 5.X template and workaround don't break a lot.
I don't have a lot of issue personally when updating skelvanilla to 5.X
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