As eluded to above, Credit Suisse has "further to go" in terms of improving its capital ratio. Both banks have the same target to acheive by 2019, UBS is ahead of CS on its progress towards this (by about 4bn). In addition, CS may have to cut dividend, which it has paid every year for 150 years. UBS may have to as well, but only started it again this year.

Poor form by the SNB in the way it was announced i'd say.