It's pretty hard to decide because we haven't had a chance to judge their differences in lap times or overall performance. I can only infer that the revised R18 will probably be very effective against the competition, judging from the domination of its previous forms. It also looks the most stunning in that comparison. The lines of the TS040 are somehow reminiscent of the GT-One, which is, in fact, my favorite 90s LMP. But in that picture, the TS040 also looks kinda...squat. The 919 isn't as stunning as the R18 in terms of looks, but I'm much more of a Porsche fan and supporter compared to the other two manufacturers. I'm really looking forward for Porsche to bring up better competition in the top class and reenact their success. Its V4 engine seems very interesting too. We haven't seen a V4 engine put into use in a car for years! V4 may sound rather underwhelming initially, but in the realm of endurance racing, I do get excited in witnessing manufacturers' exercises in deploying and making use of unusual technologies or solutions for performance efficiency. So, I think I'll choose the Porsche 919 in the end.