When using promises, should we use throw or reject when dealing with errors relating to incorrect arguments

Question

I'm using promises for async requests, and I'm wondering what's the best way to reject errors relating to invalid arguments (aka errors which can be detected immediately). I currently simply throw an error like what I normally do in a synchronous function, but wondering if this is bad practice and should I use the reject method of the promise instead?

http://jsfiddle.net/7xv8f600/

function doSomething(time) {
    //option 1
    if (typeof time !== 'number' || time <= 0) throw new Error('invalid argument');

    var deferred = Q.defer();

    setTimeout(function() {
        deferred.resolve('yay');
    }, time);
    return deferred.promise;
};

doSomething('kappa').then(function(data) {
    console.log(data);
});

function doSomething2(time) {
    var deferred = Q.defer();

    //option 2
    if (typeof time !== 'number' || time <= 0) {
        deferred.reject(new Error('invalid argument'));
    } else {   
        setTimeout(function() {
            deferred.resolve('yay');
        }, time);
    }
    return deferred.promise;
};

doSomething2('kappa').then(function(data) {
    console.log(data);
}, function(err) {
    console.log(err);
});