“Mastering” is less about the tools than it is knowing what to do (and not do), and even more about hearing whats needed for any given recording -so great monitoring is perhaps the most important piece of gear needed. Both of these sets of tools are useful, and good quality. I use Ozone all the time, and find it indispensable, but i also like and use tons of UAD plugins. Either can do what you probably need to do.
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