I wouldn't specifically look for an exJW, just date people that you're interested in. In my view it mostly turns out as a wash, with some slight disadvantages to dating an exJW, perhaps. This is speaking generally, of course, and is far from a hard rule.
Pro: You'll have a built in short-hand for talking about your past trauma, and they'll be able to immediately understand some of the challenges specific to your transition from being a JW to being a normal person in society.
Con: You won't be forced to actually think through how to explain what you experienced to someone to whom it is all new. Being forced to do this can help you come to a new understanding of your past and how to move forward. Furthermore, there's something to be said for dating someone who's willing to put in the effort to understand your past despite being completely unfamiliar with it. This can be a great litmus test to determine if someone is truly interested in you and your well-being or if they're just dating you for what they hope you'll give them.
Pro: You'll have someone who can truly commiserate on what it was like to be raised as a JW.
Con: You might find yourselves dwelling on your JW past in a sort of positive feedback loop that is not conducive to moving on with your life.
Pro: You'll both understand the language of the cult.
Con: You'll keep using the loaded language of cultspeak instead of moving on and talking like a normal person.
Pro: You'll both understand what the other is dealing with as far as their still-in JW family is concerned.
Con: Double the amount of family craziness and no family to help integrate you into normal society.
Depending on your circumstances it might also be nice to date someone that can understand the struggles of past trauma, but I would point out that JWs do not have a monopoly on trauma and when you boil it down it's all really very similar, if of different scales. And there's something to be said for dating a normal person that doesn't have demons in their past but can still be compassionate to those that do.
Personally, I think you should enjoy your freedom and date whoever you're interested in dating. I also think there's something to be said for dating both exJWs and normal folk (though exJWs are in much shorter supply...another downside) and just find what you like. Don't rush into anything, there's no formula or guidebook you can follow to get it exactly right on the first try - just try stuff and see how things work out and learn from the mistakes as you make them and strive not to repeat them. Have fun, life isn't so serious.