One thing to bear in mind is that they all have different controls and if you're into tweaking your reverb presets you might find one plugin's controls more suitable than another. For instance in terms of EQ ValhallaRoom just has a high cut control, whereas ValhallaPlate has both high and low shelves. And ValhallaPlate has a width control which personally I find very convenient and probably contributes to my motivation for reaching for it more often than the other ones.