No offence, but I hate biased people. When you don't try anything new you'll never experience something better. Just look at some reviews of both of the cards and compare them on fronts
you think are important, like sound output or cooling performance or looks or whatever
I personally don't really care about cooling performance, as long as it's adequate, and I'd go for the most silent one. You might be different, so educate yourself
Also, just for fun and giggles, look into an AMD alternative for the price you're willing to pay, and look up some reviews for that too. I don't say it's better per se (prices might be higher or lower than here), but at least consider your options.