It all depends on what you grew up operating I think.
Most things like jet skis, snow mobiles, and quads use thumb throttles.
I grew with motorcycles, I like a twist ;-}
If the bike has a clutch lever and you have 2 brake levers, a dual pull brake lever is awesome.
I use the Tetter-Todder dual pull lever that SickBikeParts carries.
http://www.sickbikeparts.com/catalo...ducts_id=41&osCsid=lll3c2vhk12q012u832hqh2sn1
It's pretty cool, it self adjusts to wear and even different pull lengths, this has a disc and a V-brake on it.
As for the bike falling over and breaking a lever, I don't think you need to worry about that bud ;-}