Many prople mentioned Juan Dolio is much safer?
Both are safe enough but for different reasons.
Boca Chica, as long as you don't follow any hooker to a RD250 room to get off, or go on a moto with a drug dealing concho. Stick pedestrian area and you're fine.
Juan dolio, it has much more quiet spots in tween places, much more chance for something to happen, a lot of Eastern Europeans in JD these days and the police are much more likely to tax you if you are alone or on a moto in JD.
Don't go to JD alone, unless you want some real time out.
I thought you had the chance to go to Bavaro? I've be on that straight away, screw this south coast, it's a sh1t tourist destination. Go to Bavaro, visit Steve's bar, pick up a friend to spend the holiday with you, you'll have to pay extra for her but you'll be assured a great time, on tap!
Also when someone who lives somewhere tells you it is better, safer, cheaper than elsewhere. Take it with a pinch of salt, life anywhere here is different for residents than tourists, entirely different.