76 was a batting friendly series bro c'mon. That's what made Holdings 14 wickets so exceptional.
Ok but I think you are overdoing Sachins flaws while glossing over Viv a bit to just suggest parity. Viv just wasn't the type to plan innings (like Sachin did to take down Warne) and adapt his game with new strokes and modified technique over his career. Viv's output declined with age and lessening of his physical attributes whereas Sachin encountered actual injuries 2003 to 2006 that put a halt to his worldclass returns.
Sachin bounced back 2007 to 2011 and that included series in SA on pace friendly wickets and a great series in Australia in 2007/8 against a very good attack. I don't think reclaiming the no.1 title at near 40 years is a small feat. It's a bit disrespectful to his mastery to just chuck that all to 'flat pitches' because even with those he was averaging 64 in his second peak, well ahead of any post-peak phase of Viv.
Viv never came close to the bat he was in his peak whereas Sachin did thanks to his technique and adaptability.
stats.espncricinfo.com