Go meet individuals from both breeds to get a better idea of which you'd prefer.
I agree with you that it's not possible to pick out the best dog for someone you don't even know. I will say that many of the BCs I've met are capable of lying quietly and watching another dog work. But those would be Border collies at stock trials. You really don't see the other kind of dog trialing. It would be frowned upon. I really think that some people (certainly not all) doing Agility and Flyball mistake over-arousal for drive and encourage that sort of behavior. Stockdog handlers recognize that a good dog can be full of drive and still control themselves, and so that's the sort of dog they choose and develop.It's dangerous and ignorant for us to pick a certain breed for you. As Tofu said you need to meet some yourself to see what your preference is. The breeds themselves have typical characteristics but every dog is an individual that may or may not have those characteristics. There are dogs in both breeds that are charged, crazy, high drive, and bonds strongly.
The border collies I've seen and met (which is at agility trials, so take this in that perspective) is insanely hyper, active, attentive, and closely (sometimes too closely) bonded with their owner. I've only met a few mals, they've also been alert and attentive, and a bit more stoic and less crazy/neurotic but still charged up and ready to go at all times.
Short answer is NO.I read on a border collie forum that the border collies can't compete in ringsport because it's too intense for them, but Mals dominate. Does that mean the Malinois is a better overall sporting breed?
Really you need to answer this. You need to realize how much money and time you can sink into these things. Also, have you had experience with either breed? I really really really don't recommend people get either breed without meeting a bunch first.Have you done any dog sports before?