Suika less lives with Reimu and more wanders Gensokyo whilst visiting the shrine fairly often. Given the frequency of Kasen's visits to Reimu and Kasen's aversion to meeting Suika face-to-face shows that Suika's, I think it's reasonable to say Suika comes to the shrine less often than Kasen.
OK, her switching between several languages within the same sentence is her one redeeming quality, I'll give her that. I still have a huge disdain for her, tho