Short answer: It depends.
Long answer:
A NAT connection shares your network connection but hides the computers behind it, in a private IP range. You can map specific ports through the NAT to a specific IP, but otherwise the computer is hidden from the rest of the network.
A Bridged connection shares your network connection and makes your VM appear like any other computer on the network. So if you can access other computers on your network from the internet, then you will be able to access a VM with a bridged connection.
There may be host firewall software/rules in place preventing any of these types of connection.
So, you may need to investigate other factors currently in place if you have a bridged connection to your VM but still cannot access it from the outside world.
