The 30-day BTS SmartPass ("Trip") cards have a 30 day expiry (use it or lose it) and are really meant for daily commuters. They can/do represent a significant discount (22 - 27 baht per trip), depending on the length of your journey, but they do come with the trade-off of expiring.
Stored value cards are good for 5 years.
Depending on your plans, you can mix/match two cards; one stored value and one trip, but you'll need to manage your usage.
AFAIK, the Rabbit card has still not been integrated into the MRT, and I haven't heard any new news regarding integration. At some point though, they will have to be integrated as, for example, the MRT/BMPCL will operate the Sukhumvit Line "skytrain" extension from Bearing to Samut Prakan, and I hope we will not have to change trains/exit-enter at Bearing?
And the SARL has their own stored value card, of course.
Last edited by transpac; Oct 14, 2014 at 6:16 pm