I can thiink of a good reason why some people may prefer the left most lane in some circumstances, but they would necessarily apply to your situation of a freeway onramp. The second left turn lane in a very large intersection can be disorienting. There aren't any drawn lanes when you're turning so as the outer lane, your reference is whatever the person in the inner lane is doing and they might be taking a wider turn than they should be or worse, they may not realize there's a second left turn lane and drift right into yours.
Add to that, depending on how many lanes we're talking about, you may also have to watch for bad drivers going the opposite direction merging in to your right at the wrong time or people making left turns on the opposite side drifting too close to you.
At least here in NorCal, the second left turn lane is a little bit more stressful to be in. The innermost lane is less drama.