The GTF, despite being 3 inches bigger in diameter produces much less thrust than the CFM LEAP-X engine.
Further, the GTF has not proven beyond doubt its so called fuel savings or lower maintenance costs.
If it had, just where are the orders for it? The 787 and A350 have had no problem racking up orders based on promises of fuel efficiency. Now contrast that to the utter failure of PW/Bombardier to get many, if any sales of the PowerPoint Jet CSeries.
The GTF engine, like the PW6000 is a promise ready to be broken and Boeing doesnt want to risk alienating its CFM/737 customers with an engine that offers zero benefits or commonality with the existing worldwide fleet.
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