Where MX is difficult, is going the other way. If I want to see what targets are assigned to a particular source, there is no way to do that except by tabbing through lots of places (18 tabs to check every possible target).
Overall, I like Pigments modulation better than MX.
In MX, lots of parameters have a maximum of 2 mod sources. The rest are 3. Too limited for me as I often put more than that. Pigments is unlimited.
Also, MX does not have MSEG's and the LFO's are weak. No LFO phase adjustment and not much shape variety.
In terms of modulation capability, I prefer Vital to both of them.