Yes !Zap is a thousand times better and more usable than the other. I do not know why they chose not to include Zap on the RISC OS SD image for the RPi, they included the other one so should include Zap for balance.
RPi = The best ARM based RISC OS computer around
More than 95% of posts made from RISC OS on RPi 1B/1B+ computers. Most of the rest from RISC OS on RPi 2B/3B/3B+ computers