〜というより
rather than, not so much … as
Plain form / Noun + というより
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というより corrects a description to a better one: 彼は友達というより、家族のような存在だ, "he's not so much a friend as family".
The first part isn't wrong, just not quite right; the second part fits better. It's common for adjusting a word: 暖かいというより、暑いくらいだ, "it's not so much warm as hot".
Plain より compares amounts (more than, less than). というより compares descriptions: which word describes the thing better?
In casual speech, it's っていうより, and っていうか at the start of a sentence means "or rather" or "I mean", a very common filler among young people.
Examples
彼は友達というより、家族のような存在だ。
He's not so much a friend as family.
今日は暖かいというより、暑いくらいだ。
Today isn't so much warm as hot.
これは料理というより、芸術だ。
This isn't so much cooking as art.
疲れたというより、眠いんです。
It's not that I'm tired so much as sleepy.
怒っているというより、悲しんでいるように見えた。
They looked sad rather than angry.