48v is better than 36v
A48 will haul more, longer. I have had both a Club Car DS and a Club Car Precedent and would buy either one again. The older DS's aren't as pretty but I think that they may be a little better built than the Precedent. When buying used, the batteries age is the major factor. Three years and they are living on borrowed time and start losing charge faster. I have seen batteries go for five plus years when taken care of properly. Most golf course leases are two to three years because of this but I wouldn't hesitate to buy an off lease cart because they will generally have been used regularly and serviced regularly instead of just sitting in some bodies garage. Figure $800-$1000 for new batteries but then you essentially have a new cart. On a 48v, six 8v batteries are better than four 12v batteries, they will have more storage capacity and will hold charge longer. Most new carts have the 4-12v because it's cheaper to replace but I know club car makes a kit to convert the Precedent over to six-8v. Most of the older DS's will have six-8v.
I have never owned a Yamaha, but a friend of a friend has a lifted Yamaha and it will turn over in a heart beat. It will get on two wheels in a moderate speed turn. I don't know if that is something inherent with Yamahas or it has something to do with the lift kit he has on it.