Hi SenseiJM,
I have no experience with any of the Rakza's other than Rakza Z and Z EH.
I tend to lean towards rubbers that have some tackiness to the top sheet and more towards a 'hybrid' type rubber, so that you get better bounce or catapult from the sponge compared to the likes of H3
I use RZ EH on the FH and RZ on BH,
Standout characteristic of both is that they have pretty high throw angle, RZ is highest, RZ EH lower. Some people find this off-putting, but with slight changes to bat angle the height over the net can be controlled. The higher throw does give some more safety especially when opening up v back/under spin.
High spin levels can be produced (with good technique) this helps drag the ball down onto the table when looping.
Overall feel is softer than one may expect from a rubber with fairly hard sponges.
Speed is fast enough.
A little spin sensitive due to the tackiness, but nothing to concern yourself over, adjust to suit.
Blocking is OK, some may prefer a little more speed from the rubber.
Short game is controllable, not too bouncy, like some rubbers with high catapult sponges.
If you are interested in trying a hybrid type rubber, then Rakza Z / Z EH wouldn't be a bad starting point.
As with all comments about equipment, its always a personal opinion, dependant on the individual and their skill level. Other posters may have a differing opinion to mine!!!