Davidson was a real workhorse. He got his wickets through attrition and frustrating the batsmen. He was very economical and skilful , but had a high SR because he lacked real strike power. Benaud would bowl and bowl and bowl him, and is on record saying how he'd coerce more and more overs out of him (Largely because the attack was often not much more than Benaud & Davo, with guys like MacKay for support, until McKenzie came along).
Davo is a reasonable choice. But he really lacked the firepower and ability to strike that Lindwall, Lillee and McGrath had.