I think generally I felt unsafe because neighbors and people in my apt. building were getting broken into and sometimes, assaulted. We were 3 on a moto (yeah, yeah I know) so not in compliance but PM was looking for some cash. Lived in a decent area in La Romana. My budget and lifestyle remained the same in Cartagena. Working remotely and studying dance. Again, I am just reporting MY experience, not making a generalized statement.
I do, however, feel that Cartagena is much safer overall as are many (but not all) parts of Colombia. There are issues in Colombia but less of the overall thuggery and lawlessness of the DR. There are things I preferred about the DR and also things I liked better in Colombia. I'm not dragging the DR but it wasn't a good place for me to live independently while not being a millionaire and able to afford Casa de Campo or something like that.
So to sum up, MY experience as a single blonde middle class woman was that Colombia was far safer FOR ME than the DR.
People on the board get very defensive with the issue of safety. Many stories of how they know how to move to stay safe. That's fine and good and I hope for your continued well-being. But it's naive to think the DR is safe, especially as safe as the USA, for example. Comparing the very best barrios of SD or Santiago with the absolute ghetto in Chicago, for example.
If you want to live in DR and enjoy the many nice things about the island, you are going to be taking some chances with your safety, that's for sure. And if you want to do that, go ahead, I've taken lots of chances with my safety and I'm still here, happy and healthy as can be. But let's not pretend that being an obvious foreigner from a 'rich' country in the 3rd world doesn't increase your chances of being targeted and victimized.