I have worked on and serviced thousands (really!) of both engines and they both have their advantages and disadvantages. Overall I would rate the 88" bike as more reliable. Nottso is right about the timken bearing, that is a point of strength. It positively locates the crank shaft. As far as the cast vs forged flywheels...I don't see that as a problem as much as the design of the wheels which is. The 96" flywheel assembly is weak and prone to shifting, much more that the earlier ones. Also the compensator assemble on the 96" bikes is suspect as well, with many failures. Rod bushings in the late bikes seem to fail more often, I don't know if it's due to their tapered design. One advantage the 96" engines have is the hydrolic cam chain tensioner. The spring loaded early ones are prone to failure and I'm sure you all know about those. Gear drive cams have their list of good and bad too, I prefer the hydrolic tension conversion kit, but that could be a whole thread in itself with most people here more interested in older machines, I have never broached the subject. To get to the original question...there are plenty of both out there with more than 35k miles. If 35k miles is the goal either will do fine.