At light heavy, of course. Who's is better? Do you like Foster's long career there? His quanity of fights, or Spink's quality?
Its pretty close unless you convince yourself Lopez and Johnson were still at their best, which they were not; especially Lopez.
I prefer Spinks's quality over Foster's quantity. Thus, I rate Spinks slightly higher at light heavyweight.
Tiger was 37 year old former middle weight ,seven inches shorter than Foster,it was am impressive ko ,but over an aging Champ.
In 69 Foster defended against Depaula,unranked,Kendall no9 In 70 Foster defended against Rouse unranked,Tessman no6 In 71 Foster defended against Carrol,unranked,Anderson unranked,Hicks unranked ,and Kelly unranked. In 72 Rondon unranked,Quarry unranked,Finnegan no6 I n 73 Fourie x2 no5 In 74 Ahumada no4 These are the Ring placings for those years, Compare them with Spinks resume.
Yes fair play to Foster he had murderous power at LH.either left hook or right cross got the job done.