If I were looking at stats only, Warne certainly wouldn't make the top five-ten list of bowlers of the last twenty years. Your argument is flawed. Spinners in general have worse stats than pace bowlers. Warne is better because he is one of the best spinners, and the fact that in many situations, good spinner is better than an outstanding fast bowler.
My arguement isn't inherently flawed. You seem unable to look past the convention - which seems to make a lot of sense on paper. However, Clive Lloyd proved that if you have bowlers like Garner, Marshall, Roberts, Croft, Holding, Ambrose and Walsh then you can succeed without a spinner very easily. It is pretty simple: you play your four best bowlers, and calling someone 'best' does factor in their ability to bowl on spin-friendly tracks. Remember, labelling India as a spin-friendly country is erronous. The problem with qualitative stereotyping is that variance can be a real arse. For every Bombay dust-bowl there's a Mohali. Canny quickies can extract more juice out of a supposed 'spinner's paradise' then a less skillful spinner.
You are compounding your errors further by assuming all fourth innings pitches are going to be helpful to the spinners, which simply is not true. Statistics, common sense and a veiwing of the matches verify that.
In a team which has Gary Sobers as a fairly effective part-time spinner, choosing a spinner would be akin to fielding a deliberately under-strength team. Tell me, which of these bowlers is better then any of Marshall, Hadlee, Garner, Lillee or Holding?
To counter your point about the fourth innings.
Lillee's fourth innings average is
26.22.
Holding's fourth innings average is
17.93.
Garner's fourth innings average is
20.43[/b[.
Marshall's fourth innings average is 17.65
Hadlee's fourth innings average is 15.62.
Imran's fourth innings average is 42.09.
Underwood's fourth innings average is 23.40.
Chandrasekhar fourth innings average is 23.47.
Bedi's fourth innings average is 14.41.
Qadir's fourth innings average is 38.0.
Embury's fourth innings average 29.78.
Based on these stats, only Bedi can compete with pacers where performance in the fourth innings in concerned. However, bear in mind that Bedi has a strike-rate of 80.3 in non-fourth innings situations. In terms of pure wicket-taking probability he doesn't compete with any of the pacers mentioned above, all of whom have much better overall strike-rates and comparable strike-rates in the fourth innings.
And Warne isn't one of the best bowlers of the last twenty years? Have you even taken a look at his overall strike-rate? Name me a bowler who has succeeded in so many places so consistently over such a long period of time. The arguement that he has played so many more matches then other bowlers even works out in his favour - the fact that he has been able to maintain such stats over so many years, not to mention rip through line-up after line-up, pretty much nullifies the assumption that other bowlers would have done equally well, given the circumstances.
None of the options in the poll come anywhere close to replicating Warne's figures, even if we take some mitigating circumstances into consideration (which work out in warne's favour anyway, given the general states of the pitches) - to compare someone like Underwood to Warne is being unfair to both of them - they are in two completely different classes as far as wicket-taking abilities are concerned. Generally, we assume wicket-taking abilities to be a measure of a bowler's ability.