Turbo jets were not included in the thread topic, but Tempests did bag 'em , unlike the P-38..
Irrelevant; we're not discussing these fighters in the context of the OP. You're trying to discuss low-altitude air superiority work, not which is the best prop-driven heavy fighter. In such a contest, everything fielded in WWII invariably loses to the 262, assuming equal pilot skill
If you DO want to discuss things in the context of the OP, then the P-38 is
inarguably the Tempest's superior. It simply a much better platform for air to ground work.
Spitfires were shooting down 'Huns' when the P-38 wasn't even operational,
yet on 1-1-45 in the ETO, they weren't past their best by date, unlike the `38,
& any Spit pilot worth his wages flying a XIV wouldn't hesitate to take on a `38 in an A2A contest - at any alt'..
And no spitfire could even hold a candle to the P-38's range, combat endurance, and ordnance capacity. The Spitfire was a superior short-range air to air fighter at low altitude, I will admit that point (with exception to the Mk XIV, which was not well suited to low altitude, and could reasonably be ranked on par with the P-38).
But the P-38 is a better escort, its a better ground attack aircraft, and better high altitude fighter (with the sole exception of the Spitfire Mk XIV). Hell, it was simply a better
aircraft than most 'Limey' fighters.
Fact of the matter is that no fighter the UK built could do the jobs that the P-38 as effectively. The Mossie would be the only fighter capable of escorting bombers to Berlin, and it doesn't look like it could have effectively protected them from 110's, much less 109's and 190's.
Oh, and check out the P-38K. P-38 was in now way past its "best by" date.