WI had a conveyor belt of great pacers that Viv never had to face. Outside of WI, don't think the quality of attacks was as good as it is in this era.
Ok let's go :
70s/80s
Australia:
Lilllee, Tommo, Walker, Gilmour, Pascoe, Alderman , McDermott, Mallet
WI: Roberts, Croft, Holding, Garner, Walsh,
Marshall
Pak:
Imran,
Wasim , Qasim
NZ:
Hadlee
Eng: Willis, Botham, Hendricks, Underwood
Ind: Dev (Prasana, Bedi, Chandra)
Now:
WI: ???
SL: ???
Rsa: Rabada,
Steyn, Philander, Morkel
Eng: Broad, Anderson
Ind: Bumrah, Shami, Siraj, Jadeja, Ashwin
Australia: Haze, Starc, Cummins, Lyons
Nz: Wagner, Boult, Jamieson, Southee
Pak: Afridi
Not much of a difference imo. The bolded are atgs and bowlers we rank in the top ten. Smith probably played better attacks but at the other end, Viv never really faced any completely dire attacks either.