Grizzly-M > Minotaur
this. easily. Minotaur is one tanky potato, but it is not a very strong engi; it has the same downside as the Anaconda in T3 with it’s module bonuses. I would even go so far, and prefer the R11 Grizzly over the R12 Minotaur aswell.
Speaking of the anaconda, you are halfway right; since it lacks the bonuses of the R9 valor, styx (effect strength) or even R8 phoenix (effect reload), the R8 anaconda is neither a good primary engineer, nor a good tank, and will not outperform the valor in this duty for the feds; it’s main upside is a crit chance bonus, and 2 cpus, it lacks the second shield module and the engine of the R9 valor however.
It’s bonus to engineer modules for energy consumption make the anaconda however a bit more flexible in using it’s energy reserves / auras, and allows the anaconda to go for some crit or range builds with it’s weapons, since energy is really not a problem. this also allows it to perform it’s duty as secondary engineer, dropping support beacons.
playing the anaconda that way makes it still a very good ship, however of course, the main show is still styx or valor, since they have simply stronger auras due to their bonuses, and the valor can go for a bit more tank.
If you compare the Valor to the Styx however, the cards are not that clear; playing a fed engi well usually makes it immensely powerful, and gives your team a lot more flexibility in flanking or positioning.
The Anaconda however is fast enough to be a secondary healer behind the lines, but of course, out in the open, it dies quickly. Also, two Anacondas can work very well together even as main engineers, since they add a bit more firepower per ship, than Styxii. They are simply more offensive engineers, and the tank is enough if you play your mobility well.