I'm currently using the Rakza 7 on the forehand after using Vega Pro for a very long time. Will post an in depth comparison in a week or two.
As a summary:
Rakza 7 has a less lively sponge on hard impact but for low to medium impact speeds, both sponges are similar (perhaps the Rakza 7 is just a touch more lively)
Rakza 7 has a fine-pored sponge with a thicker but softer and slighty less grippier topsheet. Vega Pro's topsheet is harder and grippier (among the grippiest I've ever used). For me, Rakza 7 is easier to handle in the short game (receives, pushes, better angle play possible as you can go against the spin). You need to respect the spin a bit more with the Vega Pro but I think serves have a touch more spin but this doesn't make a difference to me as I can serve well with both rubbers.
Vega Pro's sponge has larger pores and therefore you can hit very fast topspins after opening up. In terms of spin, it's very difficult to say but I think that the Rakza's spin was a bit more surprising for me and for my opponents. If you can engage the sponge, you can play some very spinny balls. Vega Pro has high spin on all shots.
In the beginning, I had problems with the Rakza 7 as I was used to contacting the ball very thinly with the Vega Pro. The same did not yield great results with the R7 but once I started to engage the sponge more, I had very good results.
R7 is easier to block with compared to the Vega Pro. The throw angle is a touch lower on all strokes. However, I wouldn't classify them both as blocking rubbers. Active play is rewarded more.
R7 was much better for me for short and long pushes. With VP, the ball would rise (also documented on tt-news.com) but this was not a problem with the R7.
In general, I find the R7 a bit slower and you have to put a bit more effort into it but I'm also using a slower blade. It is not a drastic difference though.
Both rubbers played on an OSP Virtuoso- 89g
Please feel free to ask if there are any more questions