The proper solution is one of each LOL. I love how both basses sound and play and won't sell either of them. I'd actually love another L-2000 in a different color, maybe wood tone and I want to own a USA made, Lakland 44-94 with matching headstock, eventually
The Laklands and the G&Ls are subtle variations on the same theme: a more perfect evolution of the Fender bass. Both build exceptional instruments, tailored to the slightly-divergent wants/needs of the builders. Leo obviously never stopped tweaking his design, and I consider the L2xxx to be the culmination of his vision. The Lakland basses branch off of the family tree somewhere not too far distant from the MusicMan instruments, and like the G&L have incorporated quite of bit of more-recent technologies into current designs. They're more alike than different, imho, and I don't think any of either user group would be terribly upset if they found themselves having to drive the other group's flagship instrument at a gig or session.
Having said all of that, I am particularly fond of the passive tone setup of the G&L basses. It's brilliant, even if slightly less-flexible than the Lakland LH3 preamp.
Up until I picked up my CLF L2500/750, my fretless Lakland 5502 had been the bass I always grabbed, now I'm genuinely conflicted about which one(s) to take to gigs. First-world problem, I know. Life in bass world is pretty good these days.
Full disclosure, I gig with these instruments, and they each have their strengths and weaknesses:
Alembic Series I 4-string (best sounding of them all, but it's heavy and requires an external power supply and special cable)
Lakland 5502 fretless 5-string (perfection in a fretless bass, imho)
G&L (CLF Research) L2500/750 5-string with wide spacing (just plug it in and go, any genre)
G&L Tribute L2000 4-string (just plug it in and go, any genre, and it didn't cost very much - might install flatwounds on it)
Ibanez EHB1506MS 6-string (I use it for jazz gigs where a 6-string can be handy, works without a battery)
LTD B208 8-string (great for power trio stuff, classic and progressive rock, huge sound)
Any of these except the 8-string could easily function as an only bass for me, but it's nice to have options.
John