If you are looking for burglary protection, I would advise considering alternative brands. The value of the contents of your collection, what you plan to keep inside the safe, and level of protection you desire will weigh heavily on what safe is "best" for your specific application. My lowest comfort level is a B-rated safe for low security, and a TL-15 or higher for medium-higher security. I also prefer safes with UL fire ratings over the third parties that do fire testing and their own certifications.
I do not consider base RSC's (that is, a safe that is built to the minimum construction requirements needed for the UL to accept the safe for RSC rating, in which it is awarded the RSC rating if it passes the test) to be a burglary safe due to the extremely thin side armor. (A B-rated safe that also so happens to have been tested and certified as a RSC is a different story entirely because this safe has side walls that are more than twice as thick as that base RSC.) Still, bear in mind that a RSC certification only signifies that the front door was attacked by one man with basic hand tools for only 5 minutes without being defeated...that in and of itself shows the amount of protection here is very limited. The tendency of people to (incorrectly) use the term "TL-5" to describe a RSC is extremely misleading due to dramatic differences in UL's attack procedures of safes being tested for RSC versus safes being tested for TL-15+.
Is a Fort Knox best for you? Fort Knox makes some nice products with an outstanding fit and finish and great fire protection, but a LOT of money is going toward cosmetic embellishments that do not aid security. IIRC their highest end models are B-rate safes+, but their flagship Legend is often priced HIGHER than a Graffunder C-rate-Castle or TL-15-Emperor, yet the Graffunder is far, far, far, far, far superior. Even the mid/mid-high model Fort Knox safes, especially with armor or cosmetic upgrades, can quickly get more expensive than the Brown HD (a different company than Browning). The Brown HD's minimum protection level is TL-15, and as a cosmetically plain safe it's a pretty economical option for someone wanting a safe with that, like the Graffunder, can withstand skilled tooled attacks and protect the contents in really nasty fires. The side armor of the HD is about 2.5 inches of steel plates and very high density composites. On a safe with 10 gauge side walls and fireboard, that side armor is only about .13 inches. That's a big difference. And many criminals are well aware of this.
In many cases, you can find used high security safes (i.e., a safe with a formal UL TL-15 rating or higher) for a lot less than many mid-level (and most high-level) gun safes. Just a few of the makers include Meilink, Chubb, Brown, Wilson, AmSec, DieBold, Bischoff, Mosler, Adesco, FireKing, Graffunder, ISM, Tann, Knight, etc.
Finally, whether you want a dial lock or an electronic lock, I would encourage you to invest in a high quality model. For example, the S&G 6730 is the benchmark of the Group 2 mechanical dial locks due to extreme reliability...however, the S&G 6741 has seriously scaled back on the use of brass to save money, and despite being extremely common with gun safes, this lock does not have the quality or reliability of the 6730. If the 6741 breaks (which I've seen on numerous occasions and feel its failure happens quite a bit more frequent than with the 6730), drilling the safe will cost a lot more money than outright investing in the superior 6730. If you do go in the route of a high security safe, investment in a manipulation resistant Group 2M (medium) or Group 1/1R (high) lock may also be worthwhile. The S&G 6630 g2M (which is more or less a 6730 with two added features designed to make manipulation moderately difficult) is an outstanding performer with a reasonable price.