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Are you looking for just an amp an an amp/DAC? I’m using an AQ Dragonfly Red from my iPhone to my HiFiMan HE400S and it works very well, but it’s just barely enough amp to get the job done. If you can do with something a bit larger (but still portable) I’d recommend looking at the xDuoo XD-05 Plus as well. Best of luck.
There is no 'best'. Period.
Only your ears will tell you what is 'best'.... for you.
Some people like opamp based amps, some like R2R ladder based ones, while some prefer an all-discrete based one.
Some people swear by tubes while others prefer solid-state.
The best headphone amp is the one YOU like the best at the price you want to spend.
I would recommend some planar magnetic headphones. Although I never listened to them personally, I read that they are truly amazing. Audeze, Hifiman, oppo are some of the companies that I can think of. These headphones should be paired up with an amp for true audiophile grade performance but you can also opt for low impedance headphones if you are looking for a mobile setup.
You can also go for open back headphones. Sennheiser is the first company that I would recommend because of their signature sound quality and well renowned sound signature. Beyerdynamic and audio technica are also awesome.
If you can decide on what to get i.e wired or wireless, open or closed back then you can decide on the company and product.