Re: FabFilter versus Meldaproduction
FabFilter's forte is user interfaces, which are among the cleanest and most intuitive in the industry. Meldaproduction user interfaces are, um, quirky. But resizable.
FabFilter is famously easy on CPU resources. Pro-Q on every track is no problem.
Meldaproduction stuff can be much more demanding and some have high latency you cannot get around (but for good reason).
For sound-quality, they're both in the same league, although FF is a little more forgiving of user-abuse.
In terms of features, Melda has a slight edge. Case in point: MDynamicEQ is functionally equivalent to Pro-MB (despite the name, Pro-MB is actually a dynamic equalizer in its default mode, not a multi-band compressor). Pro-MB is much prettier, but MDynamicEQ actually beats it for ease-of-use -- once you "get" the Melda Way of doing things.
Melda stuff demands more attention from the user. My favorite Melda plugin, MSpectralDynamics, will indeed distort if you overdrive the input even a little. You have to watch that and adjust the input slider accordingly. FabFilter plugins just don't do that (except Pro-C, and even then you have to work to make it sound bad).
If you're not the type who likes to study and tweak and experiment, FF is going to be more instantly accessible. Ozone and T-Racks, even more so. So for the person who's 90% musician and 10% engineer, I usually recommend Ozone or FabFilter over Meldaproduction. But if you're like me, more of a 50/50 ratio of musician to engineer (or just a control freak), Melda is the ticket.
Despite my ongoing G.A.S. problem, at least at the mastering chain I feel I'm completely covered. My master bus will often have only three plugins: MSpectralDynamics -> Ozone -> SPAN. Second-string players Pro-L, Pro-C, Pro-Q, Saturn and MDynamicEQ often come in off the bench in a pinch. Between Ozone and Pro-L I've got the full spectrum of limiter options available from slap-it-on to deep tweaking. Don't need nuttin' else.