Yeah, Global doesn't seem as generous, for sure. It's strange, since Treasure Cruise has been giving us one free Rainbow Gem per day since release [in addition to all of the other you get for working through the story content], and with Sugofest pulls you're usually guaranteed at least one of the featured units with ten pulls, not so much with Dokkan Battle. :/
I have 383 Dragon Stones I'm saving for SSGSS Goku. If I don't get him, or another solid unit [SSJ2 Gohan/Goku, SSJ STR Goku, Bardock, etc.], I'm probably just going to stop playing the game entirely and focus on Treasure Cruise.