Seasonic Focus Gold 550w or Bitfenix Whisper 550w

Dunlop0078

Titan
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They are both quite good. I would go seasonic personally, mainly just because if given the option I would take a seasonic built PSU over a CWT PSU (CWT is the OEM for the bit fenix whisper) cant really give you a good reason as to why. Mainly because everything seasonic makes is quite good, CWT makes good stuff and some less than good stuff. A review of each below.

Seasonic: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=529

BitFenix: https://www.tomshardware.com/reviews/bitfenix-whisper-series-550w-psu,4805-11.html