Crusader all the way.
Nothing beats full speed movement combined with plenty of dakka. And even more dakka when those termies have been unloaded. And it doesn't need to get too close to unleash a punishing amount firepower into whatever needs to die at the moment.
It's also considerably easier to outmaneuvre a redeemer.
But the best part is that with a crusader, you get to roll MOAR dice. AND MOAR IS BETTER!! DAKKADAKKADAKKA!!