I've been fortunate to have grown both White Chem and Cosmic Queen and I love them both. Excellent sativa "up" highs. I'd say that Cosmic Queen is perhaps a bit stronger of a high than White Chem, but not by much. The high from White Chem reminds me alot of the high from the photo strain Tropicana Cookies. Very pleasant yet functional sativa high.
Both strains were large (over 100 cm/3 feet per plant using soil & 90W LED grow light) and both had a smelly citrus scent. White Chem had an even stronger smell than Cosmic Queen, more of a classic "weed" smell from the time it was in week 3 all the way to when I harvested her. I can't describe the smell except to say that it was wonderful. I've grown over 20 Mephisto strains and White Chem was the smelliest plant of them all, from beginning to end.
Very few strains that I've bought from dispensaries can match what Mephisto puts out. My fave photo strains are Blue Dream and Sundae Driver, all the other strains that I've bought from dispensaries aren't nearly as good as my wonderful Mephisto girls! :smoking: