IMO...the best crossbow is the one you are most comfortable with. Sounds non conclusive, but in reality once the bolt leaves the bow they all do about the same thing. Some faster, some a bit more accurately, but generaly they will all put something sharp into a 8" circle on a deer at 40yrds or less. If you are uncomfortable with a bow you will not be as accurate, or confident as you will be if it fits you right.
That being said...engineering wize, Bowtech has it as far as pushing the envelope. Quality, Tenpoint. Customer service, Excal. Simplicity, Excal. Reliabiltiy...that is a toss up between all of them. Accuracy....well, that is a double edged sword. If you compare an off the shelf bow and use the bolts that the manufacture supply, it would be between Excal, Tenpoint, and Stryker. However, you tune the bolts to the bow, and all of them are about the same...
Just my opinions
Wyvern