Early Jet Engines
I believe early German engines were more technically advanced that the Whittle one, being axial flow rather than centrifugal. The reason what the ME262 had so many problems was the less advanced alloys used in their construction. Lack of nickel supply was a major cause.
Meteors and Vampires has centrifugal flow engines which had a larger cross section, and more drag than the German ones.
As an aside the Rover engine used in the JET1 car, and on industrial generator sets and firepumps was a smaller version of the whittle engine and used his patents. Firepumps powered by these were in use by RN until fairly recently