I really really like my 2-pup Greco. It is my second favorite bass after my LPB-2, and I like the neck on the Greco better (and the lighter weight). I've always been really happy that the old Pitters here turned me on to Grecos whenever that was (ten years ago? more?). I've never touched a real 60s bird, but I can do a pretty good impression of tones from Who's Next, or from Tbird-era Mike Watt stuff. I am given to understand that 60s bird pups (and Thunderbuckers) have a bit more top end.
I think the reason I've come to prefer the LPB-2 is a combination of things. I slightly prefer the ebony board to rosewood, and I am still really loving the look of a yellowburst les paul bass, and - most importantly - I've gradually come around to preferring the TB Plus pickups, heretical as that may be to many here. I think Uwe's right... they are really great. Somewhat less over the top in the mids, but still punchy as hell and very growly. I'm still lusting after a set of Thunderbuckers though
Some comparisons...
Greco, fingers, mostly neck pickup:
https://soundcloud.com/the-world-record-players/i-said-itGreco, pick, both pickups:
https://soundcloud.com/the-world-record-players/reliant-kGreco, pick, more neck pickup:
https://soundcloud.com/the-world-record-players/tailspinLPB-2, fingers, mostly neck:
https://soundcloud.com/the-world-record-players/cant-stop-living-with-itLPB-2, pick, both pickups:
https://soundcloud.com/the-world-record-players/walk-away-1Not really an apples-to-apples comparison as the latter is from a totally different recording session and I was much happier with my amp and the mix engineer. (Too bad the drum mics were a lot better on the first one. Oh well.)