Well, while it's true that both of them have very little Yuri, they both have something much more important in common - the content is primarily the voice actors and actresses screwing around and cracking themselves up. I figure that's worth mentioning.
To start with, the Canaan Drama Cd was backwards. That is, although Maria and YunYun are on the cover, the content actually features Tanaka Rie (Liang Qi) and Ohkawa Toru (Cummings.) The two of them really don't need us during this CD, because they are perfectly capable of amusing themselves without us. There were times during the conversations where they had themselves laughing so hard I couldn't for the life of me understand a word.They also both slip in and out of their roles freely so, when Ohkawa-san makes a bad joke, Qiang Li suddenly threatens him with punishment. I recall (it was a few months ago that I listened to it) that there were at least a few scenarios in which Tanaka-san, as Qiang Li, moaned with desire over Alphard. That was pretty much what Yuri there was.
Likewise, in Sweet Blue Radio, Gibu Yuuko (nicknamed "Gibuling") and Takabe Ai ("Rabuling") really didn't need us so much. :-) The bulk of the radio CD was the two of them doing their best impressions of other kinds of voice jobs - AM and FM radio announcers, the person in a department store that calls for lost people, the women on all those ubiquitous food shows who ooh and ah over mundane items like the sandwich she gushes over. Of these scenarios, the one in which Takabe-san does her impression of an AM radio DJ actually made Gibu-san snort out loud. That was worth hearing.Also amusing was the next to last track in which Okudaira Akira was a special guest and when she "leaves" the studio and "forgets' her handkerchief, Gibu-san "runs after her" and "misses" guest Manjoume Fumi when she comes to visit the studio. It was idiotic, but they were having fun with it.
In this CD, there is a 'memory' of Fumi telling Akira that she likes her and Akira responding that she didn't mind, no...she was happy about it. That's about it. But it was a sweet moment.
Both CDs are more silly than special. If you love the series and/or the voice actors and actresses, its worth it for the giggling, the puns, the utter goofiness when people who get along screw around in front of the mic.
Ratings:
Canaan DJCD - 7
Sweet Blue Radio CD - 8