Hi, how are you?
How would you compare the safety of using DD-WRT VS manufacture’s firmware?
Does one have a lesser chance of being hacked compare to the other?
I currently own a Linksys wireless router.
There can't be a simple answer to that. For one thing, which "manufacture’s firmware" are we comparing DD-WRT to? Most routers are probably as secure as DD-WRT in terms of bugs and exploits. The difference between the firmwares is in flexibility, and flexibility cansometimes make a difference to security.
In a straightforward setup, the important factors are to change all default passwords (admin, WiFi etc) and use new secure ones instead. On the WiFi side, use the most secure protocol available, and don't open or forward any port to the LAN which is not actually required.
If you have complex needs, DD-WRT is more likely (again, depending on what we compare it to) to allow you to address your needs without unnecessary lapses in security, but you would really need to know what you are doing in the first place to have such installations.
I don't think there's a simple answer to that (what manufacturer are we talking about, for one thing?). Most routers are pretty safe so long as you adhere to good practice - set strong passwords for admin, WiFi (and anything else if the router has them), use the safest WiFi standard the router supports and don't open or forward any port that is not required. Of course, some routers are probably more hackable than others, but you'd need to find out from the hacking community which ones they would target.