By that theory, the finest food you can get is at McDonalds as it sells more food than any other restaurant - and more than pretty much all the independent chef run restaurants combined - popularity does NOT equal quality.I'm a BOLD MAN! Bass players prove my point with their hard earned $$$. My personal opinion doesn't matter. Sales do.
This is not a slam on Fender - my P is a Fender, and I like it better than my G&L, but that's a model issue - the general construction and care put into the G&L are WAY better IMHO - though I am comparing to the dreaded CBS - but I too have had numerous MIJ, MIA as well as played many vintage, used and current basses - I was a dealer (and tech) for several decades and pay a visit to the local shops at least weekly to see if there's anything I need more than the money I haven't yet earned.
In the end - both of these are REALLY good options and this thread is a bit pointless as the end decision is going to be which one the individual prefers - the Fender is definitely more 'vintage' accurate - but the G&L has some nicely done updates that really add to the bass.