Before being a theravada buddhist, I was a tibetan buddhist.
The advice I have is for you not to believe when someone says that this vehicle is faster than the other vehicle. That was the reason I prefered tibetan buddhism: because of its autoproclaimed superiority both in speed and in the sense that those who practice vajrayana are of superior capacities.
Once you take this nonsense out of the way, just choose the one that is more truthful in your opinion. Joining a religion is not just about choosing what one likes. It's also about choosing what is true, even if it is at times unpleasant. Of course it's important to feel confortable in your religion otherwise you'll probably leave it.
He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.'
(Jhana Sutta - Thanissaro Bhikkhu translation)