Counting the absorb attribute.
I think Tsuna would own this because it is not sure if natsu can absorb deathperation flames.
Tsuna's a lot faster than Natsu, his attacks are arguably more powerful and he can fly. Natsu has durability on his side and the abiliity to absorb most of Tsuna's flames. But Tsuna will notice this quickly and use his zero point breakthrough to freeze Natsu.
Also notice how I said most of Tsuna's flames above. Tsuna also has his XX-Burner which effectively dissipated a black hole. Far too much power for Natsu to absorb imo.