Hifiman Serenade for Denafrips Pontus 15?

Hi there!

I have a Serenade dac/amp/preamp/streamer updated to the Hymalaya Pro Gold dac chip.

Am only going to use it with headphones. I currently have the Hifiman Arya Stealth and the FiiO FT1 and FT1 Pro.

They all sound marvelous, but I really want to know. Is it worth to upgrade do a Denafrips Pontus 15th? Is the Aune S17 a good amp for it?

Or is the Serenade more than enough and I should buy a pair of headphones with the money? Which ones?

Thank you so much!