Don't have BU steal % here with me at the moment.
Usually I don't put the hand sample size when it's pretty big and I know that stats are relevant. I'd say a few k hands for each of them.
Since it is Bu vs SB I think SB 3-bet range is definitely wider than JJ
So I wouldn´t really fold. 4-bet is fine and then calling shove or just calling pf and playing postflop