Well, I suppose I should remove tongue from cheek and give an actual answer.
Taken in isolation, there's no reason to put one before the other.
But it's not isolated. I've seen every episode of Top Gear UK and I've read some 50 or so of Clarkson's editorials and I've read up on some of the juicier incidents in his life; so thus am very well acquainted with his somewhat strained relationship with the truth. And with his inability to admit when he's been caught in a flat-out lie. That may make me biased, but I'm neither the judge nor the jury; I'm a bystander opining on the outcome.
Add to that Tesla's position:
1) They waited two years before filing suit.
2) They claim to have actual data.
3) They're not asking for an exorbitant monetary award; the money they are asking for is less than the cost of the car.
These things suggest to me that Tesla's suit is not a knee-jerk reaction, but one which was rationally reasoned. This sways my opinion over to the notion that they may actually have a solid case.
You can dismiss all of this as hearsay and personal opinion, because it is. The whole point of litigation is to attempt to determine the truth, which process is exactly what Tesla has just started. I'm betting on them.