This is an old discussion, Unyielding (https://glyph.twistedmatrix.com/2014/02/unyielding.html) discusses the trade-offs between function coloring and explicit transaction control from the point of view of "I need explicit transaction control" and of course What Color Is Your Function (https://journal.stuffwithstuff.com/2015/02/01/what-color-is-...) discusses it from the point of view of function coloring. Which one you want depends on your application, unfortunately.