Problem for me is the beefy neck. My hands are definitely on the small side, so with 1-3/4" at the nut and all, width is a problem. It's pretty beefy in general, too. The flat radius makes it a bit easier for me, but not quite enough.
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The Sterling has a neck that I just love. Just felt great on the hands. Some of it is an EBMM thing, though. Kind of surprised me, but I found the Stingrays at the store surprisingly playable, too. I expected to find them too big. I did not.
I have good-sized hands, but I really prefer skinny necks. They allow me to get around quickly. I had a first-year L-2000 that had killer tone, but over time, I found that the L-2000 got left home in favr of the other axes. Yeah, it may sound good, but if you have a real preference for a skinnier neck, then you really have to take that into account. otherwise, over time, the thing will collect dust.
Anyway, point is that I couldn't A/B the L2k and the Sterling, so it's hard for me to figure out if it'll meet my needs tonally. What I should have mentioned is that the bass will be used primarily for recording. So flexibility and how it sits in a mix are probably the two most important considerations for me. I got to play the L2000 through most of my recording equipment, so I got a good sense of that instrument. (A lot of useful range there. I really liked it.) But I haven't been able to do the same with the MM. That scares me a bit because I've often read people complaining about recording with their MMs, or active basses in general.
Actually, a lot of guys prefer active basses for recording, since they tend to be very quiet. I've recorded with a couple of MMs and had no problems. No problems with recording with several G&Ls either.
The biggest difference between the two is the tonal options. Simply put, the L-2000 will have more options -- it's got the neck pup and all those swx/knobs, etc. Maybe that's too much for you. For me, I'm a set-it-and-forget-it guy. I might tweak my tone a couple of times a set, if at all. You can probably get more low-end "grunt" as somebody said (and a good word for it, too) out of the G&L from the neck pup.
All said and done, either bass should serve you OK. If it were me, I'd tend away from the L-2000 if it's a Trib you're looking at -- you'll get better resale value with the US Sterling and the construction, in general, should be better.