Those are both pretty old bikes (1987 & 1988) Im assuming that price is a consideration but buying a cheap old bike comes with expenses down the line.
The Yamahas are great bikes... I started on a XVS250 and loved it, tho it was a chain drive which was a bit messy.
As for shaft drives... they are great, my second bike was a Boulevard C50T and was shaft driven... the key is to make sure that they are serviced and lubricated correctly... can be an expensive fix if allowed to run dry.
Other things to ponder...
Chain Drive is light, highly efficient, inexpensive, and allows you to relatively easily change your motorcycle's final drive ratio. However, it requires regular lubrication, cleaning, and tension adjustment.
Shaft Drive is heavier, almost but not quite as efficient, somewhat expensive, and makes it impractical to change the final drive ratio. However, the maintenance intervals are much farther apart.
Hope this helps.
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