Stack On, Cannon, Liberty, Sentry, and a few others all have similar and comparable safes to each other. Price point and features is key in comparing.
A huge factor that sets some models apart will be the fire rating and locking points. If I understood your concerns, the fire rating isn’t a major concern for you. 1/2 hour @ 1400 degrees is common. Longer times will = $$$
Most safes will have a 5 to 8 lock point system. $$$$ will set them apart and I ask often how much time does it really take to break into a 5 point system or a 8 point sytem. Either way, a criminal will have to work their azz off to get into it. So I would just compare the spec sheets to equivalent models to determine the best value.
I have a Stack On and a Liberty for long guns and a couple Liberty hand gun vaults. The liberty is a higher quality and came with a higher price tag. Is it worth more $$$ to me – NO. I don’t care about 100 more degrees or 10 minutes longer in time for fire. I don’t need a fancier interior, and its NOT a display case. I store business records and personal info along with firearms in it. The average criminal that may break into my home will have a heck of a time getting into either.
Volume – This is a critical thing to compare. 24 gun safes don’t store 24 rifles with scopes….. NOPE, doesn’t happen. You can figure on about half, at best, of what it is named. Also, make sure you look at the interior height. Nothing worse than buying a 448# safe, navigating it to its new home….only to find a shotgun or particular rifle is an inch or two too long.
Hand gun vaults are a different story. I wouldn’t trust anything but my Liberty HDX units. They are nearly impossible to break into.