I change my opinion regularly. If I was planning a bowling attack to win a test, I'd take the following:
Lillee
McGrath
Garner
Warne
(plus Sobers)
Bit Australian-centric, I know, but at the moment I think this attack would nearly be impossible to win against. Lillee is the master quick bowler imo, vicious, economical, charismatic, intimidating. I enjoyed watching McGrath bowl so much. Beautiful action of economy, ball on the spot, tempting the batsman to make a mistake against him, or attempt to attack him. Also, for someone who didn't seem really quick, McGrath had a deadly bouncer. Garner for first change because he filled that role so well for so long for the West Indies. Garner was relentless, building pressure and striking regularly. Could bowl long spells while the other quicks bowl shorter bursts. Height, intimidation and the ability to shut down scoring. Warne is Warne. I'm a massive fan of his. Will to win is second to none, and his mastery of cricket's hardest skill is also second to none.
The only thing I'd add to this is a left armer, but with Sobers it kind of works out ok. Wasim and Davidson are the clear contenders for that spot, and I'd be more than comfortable with either of them replacing Garner on another day.
I'm sure Marshall fans will be disgusted, but I don't rate him quite as highly (this is obviously splitting hairs as he was a great) as others. I just think with him it's a bit of a raw stats thing. His avg and SR are incredibly low. But yeh, I'd prefer the guys above in an attack, and there's a few others I'd take above him as well.
tldnr? Lillee. And Warne.