From my observation, I do think it's a matter of preference based on your experience and skill level. For example, Gary Tonon uses twister rolls a lot but he uses it to go straight to the back. Geo Martinez, on the other hand, will snatch the truck from any angle available and finish from there often. My guess is that Geo just has more experience entering, attacking, and finishing from the truck, where Gary has found more success with the back.
Another example is Eddie Bravo and Marcelo Garcia. We all know when Eddie gets in twister side, he's going for twister side attacks. Marcelo uses reverse side control (very similar to twister side), but he uses it as a set up for the back.
The point I'm making as an observer is that it does ultimately come down to preference, but the truck is absolutely a beast of a position to get into. But, unless you're in a school that teaches the truck, or have partners that put in reps with you on the side, it's a bit of a pain to carve that path into your muscle memory. I'm guessing that's why the truck isn't more prominent. Because if more guys had truck reps, we'd see more of it.
If you're a competitor, I think it's a good idea to master truck entries just as much as you master the lockdown paths. Our 10th Planet guys hit so many electric chairs, old schools, etc, it's insane. Why? Because 90% of BJJ schools don't know it, don't teach it, and still preach that 10th planet doesn't work. Same with the truck. Granted, you don't get points from it, but you have subs from there. Crotch rippers and banana splits are IBJJF legal. The straight armlock is legal. And what's great is that you still have the option to kick the guy straight into back control to get your points if you need it. And of course from the back you can sub. It takes a lot of effort to get good at it just like it takes a lot of effort to get good at rubber guard. But once you get good at it, you'll see how incredibly valuable it is.