Yes, if the information in the link above concerning the S- variety is false, then I agree it would make sense to find the best buy.
I have used several brands of ALA. They are not the same, even the ones with racemic mixtures. This leads me to the belief that all supposed racemics are not equimolar ratio (they don't have to be, I'm not arguing they are just that all brands might not be the same equivalency). For instance, one internet company commonly mentioned on this board apparently uses a racemic form. However, IMO there is no comparison to this racemic mix and Jarrow brand in terms of effect, even in higher doses. This leads me to believe there is a both a qualitative and quantitative effect with one of the ALA isomers, and that some brands apparently have more of one than the other. Whether this is due to impurities, raw material quality, etc I can only assume. If the S- form is not at all harmful or negating of the effects gained from a primarily R+form then one should choose the best value.
I do think that the S- form has certain effects that can be positive, and so I don't think it's a strictly black and white issue with either enantiomer. Good research for either isomer exists, but the application for fat loss purposes IME lends credence to higher quality raw materials. I think time will tell which isomer is best for fat loss/ muscle gain purposes.