If the boot is cracked on the sway bar link or dogbones, then there is a big chance that there is dirt in the part already.
If you don't have the cash, go with the cheapest brand... but you know that it will happen again in 6 month to 1 year.
Do it right with Lemforder parts and do it once... I think that there is ball joint replacement boots for the ball joints on the thrust arms and control arms, but I don't think there is any for the sway bar links.
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars