The poll is invalid - there is no '0' option:
But in all seriousness, the 20 of a standard Fender bass is not enough. The Warwick is nominally 24 and the others are nominally 21, but in real terms the Warwick fingerboard is easily playable to the equivalent of 25 and the Eko is just playable to the equivalent of 22. The StingRay doesn't quite make it to 22 on the 1st and 4th strings but is just about there - perhaps a few cents flat - on the 2nd and 3rd.
But in all seriousness, the 20 of a standard Fender bass is not enough. The Warwick is nominally 24 and the others are nominally 21, but in real terms the Warwick fingerboard is easily playable to the equivalent of 25 and the Eko is just playable to the equivalent of 22. The StingRay doesn't quite make it to 22 on the 1st and 4th strings but is just about there - perhaps a few cents flat - on the 2nd and 3rd.